by Quick answer: RV bunk mattresses are narrow — typically 28" to 35" wide and 75" to 80" long — and often thin (4"–6") to fit low clearance. Always measure your bunk platform and ceiling gap first, since sizes vary widely by brand and model year.
By the MattressNut editorial team · Updated June 2026
RV Bunk Mattress: What to Know
Bunk mattresses are the trickiest RV size because manufacturers shave inches to fit tight layouts. They tend to be smaller than people expect, and an RV twin is not the same as an RV bunk. Bunk spaces also often have low vertical clearance, so a thick mattress can leave too little headroom.
Because of that variation, measuring is non-negotiable here — more so than for the main bed.
Sizing & What to Look For
| Factor | Detail |
|---|---|
| Width | Commonly 28"–35"; sizes like 28"x75", 30"x75", 30"x80", 34"x75", 35"x79" |
| Thickness | 4"–6" is typical for bunks; thicker only if clearance allows |
| Clearance | Measure platform-to-ceiling — low headroom caps how thick you can go |
| Corners | Bunks may have rounded, angled, or notched corners needing a custom cut |
Our Top Pick
For bunks, we recommend PlushBeds because they build mattresses specifically for RV and mobile spaces, including thinner profiles suited to low-clearance bunks, with organic and eco-foam material options. Start at the MobilePlush RV line and choose the thickness and size that match your measured bunk — confirm the exact dimensions against your platform before ordering.
Check the PlushBeds RV mattress · see the eco option
On a Budget
For kids' bunks used occasionally, a low-cost thin foam mattress cut or sized to fit is often plenty. Match the width, length, and thickness to your measurements.
See Sweetnight budget mattresses
The Bottom Line
Bunk mattresses are all about fit: narrow widths, thin profiles, and sometimes odd corners. Measure the platform and the headroom before you buy anything.
Bottom line: Measure width, length, and clearance first — bunk sizes vary too much to guess.
MattressNut may earn a commission from these links, at no extra cost to you.
Related: our best RV mattress guide.