Top pick
RVMattress.comSignature Hybrid
- Hybrid
- 13.25 in thick
- Soft / Medium / Firm
Sleep Foundation: Best Mattress Overall Read review
$1,865RV King - 72x80 · list priceSee price
Forest River Berkshire 40B mattress size
Main bed72 × 80 inRV king
That's an RV king, 4 in narrower than a regular king (76 × 80 in). A regular king won't fit, so get an RV king in exactly 72 × 80 in.
About the RV king size →2018 Forest River Berkshire XL brochure, 2018.
Mattresses in 72 × 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
$40372" 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
$2,465RV King - 72x80 · list priceSee price
Best memory foam
Mattress InsiderElation Gel Foam
- Memory foam
- 6 in thick
- cushion firm
$65972" x 80" · list priceSee price
Best hybrid
RVMattress.comCopperFlex RV Hybrid
- Hybrid
- 10 in thick
- Medium-Firm
$1,065RV King 72x80 · 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
$1,532RV King - 72x80 · list priceSee price
Reviewer pick
HelixHelix Midnight
- Hybrid
- 11.5 in thick
- Medium Feel
Sleep Foundation: Best Mattress for Side Sleepers Read review
$1,489RV King · 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
$84972" x 80" · list priceSee price
Is this your 40B?
Check the year and length against your RV before you order.
| Year | Model | Length | Sleeps |
|---|---|---|---|
| 2017 | Berkshire XL Diesel 380HP Engine 40B | 41' 0" | – |
| 2018 | Berkshire XL Diesel 380HP Engine 40B | 41' 0" | – |
Other Berkshire mattress sizes
Sources
- Forest River (forestriverinc.com), archived copy: https://web.archive.org/web/20170601064127/http://www.forestriverinc.com:80/class-a-motorhomes/berkshire-xl
- Forest River (forestriverinc.com), archived copy: https://web.archive.org/web/20180615115410/http://www.forestriverinc.com:80/class-a-motorhomes/berkshire-xl?Tab=1
Questions
What size mattress is in the Forest River Berkshire 40B?
The main bed is 72 × 80 in (2018 Forest River Berkshire XL brochure, 2018).