Great all around
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
Heartland Bighorn 40DB 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 →Heartland spec page, 2026.
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
RVMattress.comCopperFlex Essential
- All-foam
- 6 in thick
- five comfort options
$799RV King - 72x80 · list priceSee price
Firm
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
Cooling
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
Heavy duty
RVMattress.comTitan Plus Luxe
- Hybrid
- 13 in thick
- Plush
$1,865RV King - 72x80 · list priceSee price
Helix 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
RV hybrid
RVMattress.comCopperFlex RV Hybrid
- Hybrid
- 10 in thick
- Medium-Firm
$1,065RV King 72x80 · list priceSee price
Custom size
Mattress InsiderLuxury Gel Memory Foam
- Memory foam
- 8 in thick
- not stated
Made to 72 × 80 inGet a quote
The Bighorn bedroom. Measure the platform, not the old mattress, before you buy.
The 40DB floorplan
Heartland's 2026 40DB floorplan.
Is this your 40DB?
Check the year and length against your RV before you order.
| Year | Model | Length | Sleeps |
|---|---|---|---|
| 2026 | Bighorn 40DB | 43' 10" | 8 |
Other Bighorn mattress sizes
Sources
- Heartland (heartlandrvs.com): https://heartlandrvs.com/rv-model/40db/
Questions
What size mattress is in the Heartland Bighorn 40DB?
The main bed is 72 × 80 in (Heartland spec page, 2026).