Custom size
Mattress InsiderPark Meadow Encased Coil II
- Hybrid
- 8 in thick
- cushion-firm
Sleep Foundation: Best Mattress for Pressure Relief Read review
Made to 66 × 78 inGet a quote
Forest River Salem 31KQBTS mattress size
Main bed66 × 78 inCustom size
That isn't a standard mattress size, so order a custom size cut to your platform.
Dealer report, 2025. A reported size, not a guarantee: measure your platform first.
Bunks30 × 74 in / 38 × 74 in
Bunk. Forest River spec sheet, 2021.
Common RV bunk sizes →
Mattresses in 66 × 78 in
We may earn a commission when you buy through some of these links. It doesn't change which mattresses we list.
Bunk mattresses in 30 × 74 in / 38 × 74 in
Some bunks have a rounded corner, so trace yours before a custom cut. A thicker bunk mattress takes headroom from the bunk above.
Top pick
RVMattress.comCopperFlex RV Hybrid
- Hybrid
- 10 in thick
- Medium-Firm
$699RV Bunk - 30x74 · list priceSee price
Custom size
Mattress InsiderPark Meadow Encased Coil II
- Hybrid
- 8 in thick
- cushion-firm
Sleep Foundation: Best Mattress for Pressure Relief Read review
Made to 30 × 74 inGet a quote
Top pick
RVMattress.comSignature Hybrid
- Hybrid
- 13.25 in thick
- Soft / Medium / Firm
Sleep Foundation: Best Mattress Overall Read review
$959Twin · list priceSee price
Best value
RVMattress.comCopperFlex Essential
- All-foam
- 6 in thick
- five comfort options
$299Twin · list priceSee price
The Salem bedroom. Measure the platform, not the old mattress, before you buy.
Bed sizes by year
| Year | Main bed | Bunks | Other beds | Source |
|---|---|---|---|---|
| 2021 | – | 30 × 74 in, 38 × 74 in | – | 2021 Forest River Salem brochure |
| 2021 | – | 30 × 74 in, 38 × 74 in | – | Forest River spec sheet |
| 2025 | 66 × 78 in King | – | – | Dealer report |
Years not listed weren't published.
Is this your 31KQBTS?
Check the year and length against your RV before you order.
| Year | Model | Length | Sleeps |
|---|---|---|---|
| 2021 | Salem 31KQBTS | 36' 7" | – |
| 2026 | Salem 31KQBTS | 36' 7" | 8 |
| 2027 | Salem 31KQBTS | 36' 7" | 8 |
Other Salem mattress sizes
Sources
- funtownrv.com: https://www.funtownrv.com/product/new-2027-forest-river-rv-salem-31kqbts-3706022-29
- funtownrv.com: https://www.funtownrv.com/product/new-2026-forest-river-rv-salem-31kqbts-3578904-29
- recreationalvehicles.info: https://recreationalvehicles.info/2021-forest-river-salem/2021-forest-river-salem-brochure-page-003.jpg
Questions
What size mattress is in the Forest River Salem 31KQBTS?
The main bed is 66 × 78 in (Dealer report, 2025).
What size are the Forest River Salem 31KQBTS bunk mattresses?
30 × 74 in / 38 × 74 in (Forest River spec sheet, 2021).