Buying guide · 10 min read · Updated October 2, 2026

4 Best Split King RV Mattress in 2026: A Practical RV Guide

Four split king and split Cali king RV mattresses compared on 36x84 RV sizing, hybrid or foam builds, cooling covers and trial terms for two sleepers.

By Bowen HigginsRV Editor at RV Gear Lab4 products comparedSpec-sheet researched

Most couples who upgrade an RV mattress do it for the same reason: one person sleeps hot, the other sleeps cold, one wants firm support and the other wants a softer contour, and the stock foam slab that came with the coach suits neither. A split design gives each sleeper a separate half, so the two feels can differ, motion from one side does not reach the other and each half is lighter to carry through a narrow RV door. For a rig that you cannot easily open up or lift a mattress into, that last point matters more than any marketing claim.

The catch is sizing, and it trips up many first-time buyers. A residential split king is built from two halves that fit a standard bedroom frame. An RV split Cali king is a different size, listed here at 36 by 84 inches per half, which is longer and narrower to suit RV bed platforms. Ordering a residential split king for a coach that needs the 36 by 84 size, or the reverse, results in gaps, overhang or a mattress that will not fit through the door. Measure the platform first, and treat the product title as a spec rather than a label.

Four picks are covered. The Tru Lux Cool 12 inch hybrid and the Lux Black Cool Hybrid are both RV-specific 36 by 84 split Cali king sizes. The Renanim hybrid and the Renanim foam are residential split king sets, one with steel coils at 10 inches and one all-foam at 12 inches. The prices run from $395.00 to $580.00 for the set, and all four list cooling features, so the decision comes down to size, support style and thickness.

We evaluated each mattress on size match, construction, cooling, edge support, trial and warranty terms and price, using published specs, warranty terms and owner feedback. This ranking rests on the spec sheets and the pattern in owner reports. Before ordering any of them, measure your platform length and width, check the clearance above the mattress to the cabinets or ceiling and confirm the path through the RV door and bedroom entry. Also check how the bed is raised, since many RV platforms lift on hydraulic struts and a heavier mattress can make the lift stiffer than it was with the factory foam.

RV Gear Lab field notes

The Rig Fit Check

Start with the job: Tru Lux Cool 12” Hybrid RV Mattress leads this shortlist for RV split Cali king beds. Use that fit as a reference point, then compare the alternatives against your own space and workload.
Specs that separate the picks: The first details to compare are 36x84 split Cali king, 10 inch split king. Confirm the exact model and included components before ordering.
Trade-off to plan for: Twelve inches is tall for some platforms

Before you buy

What Matters Before You Choose a Split King RV Mattress

Key buying criteria so you get the right fit the first time.

01
Size and platform fit
A split king is two halves that match a residential frame, while an RV split Cali king here is 36 by 84 inches per half. A mattress that is a few inches off leaves a gap along the platform or overhangs the edge. Measure your platform and compare it with the dimensions in the product title and details before ordering.
02
Hybrid or foam construction
A hybrid layers foam over pocketed coils, which adds support, edge strength and airflow, while all-foam beds contour more and isolate motion. The difference changes how the bed feels and how heavy it is to move. Look for the layers described in the listing, and decide whether you prefer a springy or a hugging feel.
03
Thickness and clearance
A 12 inch mattress is plush, but it sits higher than a 10 inch one, and in an RV that can mean less headroom and trouble with cabinet doors. Measure from the platform to the ceiling or cabinet bottom. Check the stated mattress height and subtract it from your clearance to make sure you have at least a few inches to spare. Remember that sheets, a topper and a protector all add height, and a taller bed also makes climbing in harder.
04
Firmness and sleep position
Firmness is a scale from soft to firm, and the right setting depends on how you sleep. Side sleepers usually want more give at the shoulder and hip, while back and stomach sleepers want support. Look for the stated feel, such as medium or medium firm, and read buyer feedback from people who sleep the way you do. Since each half of a split set can be a different feel only if you buy two different models, a couple that disagrees on firmness may prefer a mattress topper on one side.
05
Cooling features
Gel foam, copper infusion, graphite and phase change covers all aim to move heat away from the sleeper. They are stated features, and a small RV bedroom with little airflow makes them more relevant. Look for the specific cooling materials in the listing, and treat the claims as helpful extras instead of a replacement for ventilation.
06
Trial period and warranty
A mattress feels different after a week than in the first night. A 100-night trial lets you return it if it does not suit you, and a 10 year warranty covers defects in the foam or coils. Read the trial terms for return shipping details, and keep the packaging until the trial period ends. Give a new mattress at least two or three weeks before judging it, because your body needs time to adjust to a different surface.

Our standards

Why You Can Trust RV Gear Lab

At RV Gear Lab, we compare products based on rig fit and power or hookup compatibility, verified specifications, usability, setup requirements, weight, durability, and real-world trade-offs. We do not rank products purely on marketing claims or commission rates.

We have not personally tested every product listed. Where hands-on testing is not available, recommendations are based on verified manufacturer specifications, product documentation, use-case fit, and comparative research.

How we review RV gear →

Detailed reviews

The 4 best split king rv mattress, explained

Best Overall · 1 of 4

Tru Lux Cool 12” Hybrid RV Mattress

36x84 split Cali king
12 inch pocketed hybrid
Phase change cover

Check price on Amazon

Best for: RV split Cali king beds

Our take

This is the pick for couples with an RV split Cali king bed who want a luxury hybrid and cooling comfort.

Why it made the shortlist

The RV Mattress Solutions Tru Lux Cool is a 12 inch hybrid in the 36 by 84 split Cali king size made for RVs. It layers gel-infused memory foam and HD comfort foams over individually wrapped pocketed coils, with HD edge reinforcement and a plush phase change cover that pulls heat away from the body. It carries a 10 year warranty and costs $520.00.

Against the Lux Black below it, the Tru Lux adds the phase change cover and a plush top, so the surface feels cool to the touch and softer on contact. The reinforced edge stays firm when you sit on the side to put on shoes, which matters in a narrow bedroom where edge sitting is constant. Compared with the Renanim sets, it is sized to RV platforms instead of a residential frame.

It suits owners who sleep warm, full-timers who spend every night on the mattress and anyone who values a plush feel with edge support.

What works

Sized to RV split Cali king beds
Cool-to-touch cover pulls heat away
Reinforced edge stays firm when sitting

Watch out for

Twelve inches is tall for some platforms
Heavier than all-foam options

Check price on Amazon

Best Medium Hybrid · 2 of 4

Lux Black Cool Hybrid 12” RV Mattress

36x84 split Cali king
Elate visco foam
10 year warranty

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Best for: Couples wanting firmer support

Our take

This is the pick for couples who prefer a steadier surface and want an RV-sized hybrid at a lower price.

Why it made the shortlist

The Lux Black Cool Hybrid is a 12 inch medium hybrid in the same 36 by 84 split Cali king size, built with Elate visco foam infused with copper, gel, silver and graphite. Individually wrapped TRU coils and a moisture-wicking six-way stretch cover complete the build, and the listing notes a 10 year warranty and CertiPUR foam made in the USA. It costs $395.00.

Next to the Tru Lux above it, the Lux Black uses a firmer medium feel and a stretch cover in place of the phase change fabric, and it saves $125. The copper and graphite infusions move heat away from the sleeper, and the pocketed coils help keep motion from crossing between sleepers. Against the residential sets, the RV sizing means no gaps along the platform.

It suits back and stomach sleepers, owners who want American-made foam and anyone upgrading a worn factory mattress without paying for a plush cover.

What works

Copper and graphite foam moves heat away
Pocketed coils reduce motion between sleepers
Made in USA with CertiPUR foam

Watch out for

Medium feel may be firm for side sleepers
Needs deep bed clearance

Check price on Amazon

Best Residential Hybrid · 3 of 4

Renanim Hybrid Mattress Split King

10 inch split king
Six layers with coils
100-night trial

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Best for: True split king beds

Our take

This is the pick for campers with a true split king platform, such as a custom-built bed or a converted rig, who want a firm hybrid with a trial period.

Why it made the shortlist

The Renanim Hybrid Mattress is a 10 inch split king with six layers, including triple-layered cooling gel memory foam over individually encased steel coils. It is CertiPUR-US and OEKO-TEX certified and ships in a box with a 100-night trial and a 10 year warranty. It costs $560.00.

At 10 inches, it is also two inches thinner than the foam model, which helps in a coach with limited clearance above the platform. Compared with the RV-specific hybrids above, it is a residential split king, so it suits beds that follow that size.

It suits owners who like the reassurance of a 100-night return window and sleepers who run warm and want coil airflow.

What works

Steel coils add firm support and airflow
Six layers include cooling gel foam
Certified foam with 100-night trial

Watch out for

Residential split king, not an RV size
Firm feel may suit few side sleepers

Check price on Amazon

Best Foam Option · 4 of 4

Renanim Split King Medium Firm Cooling Gel Memory Foam Mattress

12 inch gel foam
Reinforced edges
100-night trial

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Best for: Quiet foam split king

Our take

It suits campers who want a quiet all-foam mattress with a softer contour and a trial period.

Why it made the shortlist

The Renanim Split King Medium Firm Cooling Gel Memory Foam Mattress is a 12 inch foam set with a resilient base foam, reinforced edges and a breathable cover. It ships rolled with a 100-night trial and a 10 year warranty. The feel is medium to medium-firm, and it costs $580.00.

Against the Renanim Hybrid above it, the foam model is quieter and lighter because it has no coils, and at 12 inches it is two inches thicker. The foam isolates motion, so one sleeper can turn over without waking the other. Compared with the RV-specific mattresses, it is a residential split king, so it suits platforms built for that size.

It suits light sleepers, side sleepers who want pressure relief and owners who prefer a rolled box that is easier to carry through a narrow entry.

What works

Motion isolation lets partners sleep apart
Reinforced edges resist collapse
Ships rolled and easy to carry in

Watch out for

Residential split king, not an RV size
Foam may sleep warmer than hybrids

Check price on Amazon

Methodology

How We Built This Shortlist

Each pick was assessed across 5 criteria weighted for real-world use.

Size match for RV platforms

Sizing is the biggest risk with a split mattress. We compared the 36 by 84 split Cali king size on the Tru Lux and Lux Black with the residential split king listings on both Renanim sets, and we put the size match first because a wrong size cannot be fixed with extra comfort.

Construction and support

A hybrid and an all-foam bed feel different. We compared the pocketed coils and reinforced edge on the Tru Lux, the TRU coils on the Lux Black, the steel coils on the Renanim hybrid and the resilient base foam on the Renanim foam, and we judged support, edge strength and motion isolation.

Cooling and cover

Warm sleepers notice cooling features. We compared the phase change cover on the Tru Lux, the copper and graphite infusion on the Lux Black, the cooling gel in both Renanim sets and the breathable covers, treating each as a stated feature rather than a measured result.

Thickness and clearance

RV bedrooms have low ceilings and tight cabinets. We compared the 12 inch Tru Lux, Lux Black and Renanim foam with the 10 inch Renanim hybrid, since two inches of thickness can decide whether a sleeper bumps a cabinet or fits comfortably.

Trial, warranty and price

A big purchase deserves a safety net. We compared the 100-night trial on both Renanim sets with the 10 year warranties listed across the picks, and weighed each against prices from $395.00 to $580.00 for the set.

Decision guide

Match a Split King RV Mattress to Your RV

By Bed Platform Size

The platform size is the deciding fact. Measure the length and width of each half of your bed before looking at comfort, since sizes differ between RV and residential frames.

Your platform	Recommended pick	Why
RV split Cali king, 36 by 84 inches per half	RV Mattress Solutions Tru Lux Cool 12 inch Hybrid	Sized to the RV split Cali king and adds a phase change cover.
RV split Cali king, firmer feel wanted	Lux Black Cool Hybrid 12 inch	Same 36 by 84 size with a medium feel at $395.00.
Residential split king, firm hybrid wanted	Renanim Hybrid Mattress Split King	10 inch split king with steel coils and a 100-night trial.
Residential split king, foam wanted	Renanim Split King Medium Firm Foam Mattress	12 inch all-foam set with motion isolation.

By Budget

The four sets are priced between $395.00 and $580.00, and the cheapest is also an RV-sized hybrid. Here is how the money breaks down.

Budget	Recommended pick
Under $450	Lux Black Cool Hybrid at $395.00, an RV-sized medium hybrid with a 10 year warranty.
$450 to $550	Tru Lux Cool at $520.00, an RV-sized hybrid with a phase change cover.
$550 and up	Renanim Hybrid at $560.00 or Renanim Foam at $580.00 for residential split king platforms with 100-night trials.

Hybrid vs All-Foam

The construction decides how the bed feels, sounds and sleeps. Both types appear in this lineup, and the best one depends on your sleep habits.

Hybrid with pocketed coils

The Tru Lux, Lux Black and Renanim Hybrid place foam over individually wrapped or encased coils. The coils add support, airflow and edge strength, and they reduce motion between sleepers. Hybrids tend to feel more responsive and sleep cooler, though they weigh more than foam.

All-foam construction

The Renanim Foam is a 12 inch set of gel memory foam over a resilient base foam. It contours around the body, isolates motion and ships rolled in a box that is easier to carry through a narrow entry. Foam can sleep warmer, though the cooling gel and breathable cover help.

Most couples who want firm support and airflow should choose a hybrid, and light sleepers who want a soft contour can choose the foam set.

By Sleeper Type

A second way to decide is by how each half will be used. The halves can feel the same, or each sleeper can choose.

Sleeper	Recommended pick
Hot sleeper wanting a cool-to-touch cover	Tru Lux Cool, with a phase change cover that pulls heat away.
Back or stomach sleeper wanting firm support	Lux Black Cool Hybrid (medium feel) or Renanim Hybrid (firm feel).
Side sleeper wanting a softer contour	Renanim Foam, a medium to medium-firm gel memory foam.
Light sleeper disturbed by a partner's movement	Renanim Foam or Tru Lux, both noted for motion isolation.

For Narrow RV Doors and Tight Bedrooms Specifically

Getting the mattress into the coach is half the job. A split set helps, and a few other details matter.

Look for

Split halves that each fit through the entry, a thickness that clears the ceiling and cabinets, a mattress that ships compressed or rolled and reinforced edges that stay firm when you sit on the side. Measure the door, the hallway turn and the bed height before ordering.

In this comparison

The Renanim Foam ships rolled, and the Renanim Hybrid ships in a box with a 100-night trial. The Tru Lux and Lux Black are 12 inch RV-sized hybrids, with HD edge reinforcement on the Tru Lux for sitting on the side of the bed.

When to Spend More

A set costs hundreds of dollars, and you will use it every night, so a few extra dollars per night of sleep is easy to justify. Here is how to decide.

Spend more if

Spend $520.00 on the Tru Lux if you sleep hot, live in the coach and want the phase change cover and reinforced edge. Spend $560.00 or $580.00 on a Renanim set if your platform is a true split king and you want a 100-night trial.

Save if

Save with the Lux Black at $395.00 if you want an RV-sized hybrid with copper and graphite foam and a 10 year warranty. A medium feel suits many couples, and the $125 saved can go toward quality sheets or a topper.

FAQ

Before You Bring One Home

What is the difference between a split king and a split Cali king in an RV?

A residential split king is two halves that match a standard bedroom frame. The RV split Cali king here is 36 by 84 inches per half, longer and narrower to fit RV platforms. Ordering the wrong one leaves gaps or overhang, so measure the platform first.

Can I use a residential split king in my RV?

Only if your platform matches the split king dimensions, which is common in custom or converted rigs but not in most factory coaches. Measure the bed, check the height clearance and plan how the halves will go through the door before you order a Renanim set.

Is the 520 dollar Tru Lux worth more than the 395 dollar Lux Black?

The Tru Lux adds a plush phase change cover and a softer top. The Lux Black has a firmer medium feel and a stretch cover. If you sleep hot and prefer plush comfort, the extra $125 is reasonable. If you prefer firm support, the Lux Black does the job for less.

How do I get a mattress into an RV bedroom?

Measure the door, the hallway and the bed opening, then pick a split set so that each half is lighter and narrower. A rolled or boxed mattress is easier, so compress it until you reach the bedroom, then unpack it and let it expand for the time stated in the instructions.

How long does a rolled mattress take to expand?

Most compressed mattresses reach shape within a few hours, though full expansion can take a day or longer. Follow the instructions, give the foam room and avoid sleeping on it until it has fully expanded. Cold temperatures slow expansion, so warm the room first.

How do I care for an RV mattress in humid weather?

Air out the bed regularly, lift the mattress occasionally to let the platform breathe and consider a mattress protector. RV bedrooms can trap moisture, so use a vent fan or dehumidifier in humid conditions. A moisture-wicking cover helps, but good airflow does more.

Bottom line

The short version

If your coach has a 36 by 84 split Cali king platform, the Tru Lux Cool at $520.00 is the most complete pick, with a phase change cover and reinforced edge. The Lux Black at $395.00 offers the same size with a firmer medium feel for $125 less.

If you have a true split king platform, the Renanim Hybrid at $560.00 gives you a firm 10 inch build, and the Renanim Foam at $580.00 gives you a 12 inch quiet foam option, each with a 100-night trial. Measure first, check clearance and make sure each half can get through the door.

A good mattress is one of the few upgrades that improves every night in the coach. Spending a little extra time on measurements and a little extra on the right size and support style pays off for years, while a mismatched bed becomes an expensive return that nobody enjoys carrying back out the door.

Browse more split king rv mattress on Amazon →

About the author

Bowen Higgins

RV Editor at RV Gear Lab

Bowen covers RV power, water systems, towing and leveling, upkeep and interior comfort, with a focus on matching gear to the rig, the hookups and the way you actually travel.

4 Best Split King RV Mattress in 2026: A Practical RV Guide

Our top picks

The Rig Fit Check

What Matters Before You Choose a Split King RV Mattress

Size and platform fit

Hybrid or foam construction

Thickness and clearance

Firmness and sleep position

Cooling features

Trial period and warranty

Why You Can Trust RV Gear Lab

The 4 best split king rv mattress, explained

Tru Lux Cool 12” Hybrid RV Mattress

Lux Black Cool Hybrid 12” RV Mattress

Renanim Hybrid Mattress Split King

Renanim Split King Medium Firm Cooling Gel Memory Foam Mattress

How We Built This Shortlist

Size match for RV platforms

Construction and support

Cooling and cover

Thickness and clearance

Trial, warranty and price

Match a Split King RV Mattress to Your RV

By Bed Platform Size

By Budget

Hybrid vs All-Foam

By Sleeper Type

For Narrow RV Doors and Tight Bedrooms Specifically

When to Spend More

Before You Bring One Home

What is the difference between a split king and a split Cali king in an RV?

Can I use a residential split king in my RV?

Is the 520 dollar Tru Lux worth more than the 395 dollar Lux Black?

How do I get a mattress into an RV bedroom?

How long does a rolled mattress take to expand?

How do I care for an RV mattress in humid weather?

The short version

Bowen Higgins

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