Top pick
RVMattress.comSignature Hybrid
- Hybrid
- 13.25 in thick
- Soft / Medium / Firm
Sleep Foundation: Best Mattress Overall Read review
$1,465Queen · list priceSee price
Forest River Sierra 40DUPLEX mattress size
Main bed60 × 80 inQueen
That's the same size as a regular queen, so any standard queen mattress fits.
About the RV queen size →Forest River spec sheet, 2025.
Bunks32 × 74 in / 54 × 74 in
Bunk. Forest River spec sheet, 2025.
Common RV bunk sizes →
Mattresses in 60 × 80 in
We may earn a commission when you buy through some of these links. It doesn't change which mattresses we list.
Best value
Mattress InsiderThe Sedona
- All-foam
- 5.5 in thick
- Firm
$36160" x 80" · list priceSee price
Reviewers' favorite
RVMattress.comAurora Luxe Cooling
- Hybrid
- 13.25 in thick
- Soft / Medium / Firm
Sleep Foundation: Best Mattress for Temperature Regulation Read review
$1,999Queen · list priceSee price
Best memory foam
Mattress InsiderElation Gel Foam
- Memory foam
- 6 in thick
- cushion firm
$45960" x 80" · list priceSee price
Best hybrid
RVMattress.comCopperFlex RV Hybrid
- Hybrid
- 10 in thick
- Medium-Firm
$799Queen · list priceSee price
Best all-foam
RVMattress.comPlank Firm
- All-foam
- 10 in thick
- Firm / Extra Firm
Mattress Clarity: Best RV Mattress for Heavy People Read review
$1,332Queen · list priceSee price
Reviewer pick
HelixHelix Midnight
- Hybrid
- 11.5 in thick
- Medium Feel
Sleep Foundation: Best Mattress for Side Sleepers Read review
$1,183Queen · list priceSee price
Reviewer pick
Mattress InsiderPark Meadow Encased Coil II
- Hybrid
- 8 in thick
- cushion-firm
Sleep Foundation: Best Mattress for Pressure Relief Read review
$66960" x 80" · list priceSee price
Bunk mattresses in 32 × 74 in / 54 × 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 Essential
- All-foam
- 6 in thick
- five comfort options
$385RV Bunk - 32x74 · list priceSee price
Best value
RVMattress.comCopperFlex RV Hybrid
- Hybrid
- 10 in thick
- Medium-Firm
$699RV Bunk - 32x74 · 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 32 × 74 inGet a quote
The 40DUPLEX floorplan
Forest River's 2025 40DUPLEX floorplan.
Is this your 40DUPLEX?
Check the year and length against your RV before you order.
| Year | Model | Length | Sleeps |
|---|---|---|---|
| 2024 | Sierra Destination 40DUPLEX | 42' 10" | – |
| 2025 | Sierra Destination 40DUPLEX | 42' 10" | – |
Other Sierra mattress sizes
Sources
- Forest River (forestriverinc.com), archived copy: https://web.archive.org/web/20250809054432/https://forestriverinc.com/rvs/sierra-destination/40DUPLEX/9591
- Forest River (forestriverinc.com), archived copy: https://web.archive.org/web/20260413212031/https://forestriverinc.com/rvs/sierra-destination/40DUPLEX/10030
- Forest River (forestriverinc.com), archived copy: https://web.archive.org/web/20250828085540/https://forestriverinc.com/rvs/ImageHandler/278576/2025_Dest%20S25_40PLEX%20copy%202.webp
Questions
What size mattress is in the Forest River Sierra 40DUPLEX?
The main bed is 60 × 80 in (Forest River spec sheet, 2025).
What size are the Forest River Sierra 40DUPLEX bunk mattresses?
32 × 74 in / 54 × 74 in (Forest River spec sheet, 2025).