Top pick
RVMattress.comSignature Hybrid
- Hybrid
- 13.25 in thick
- Soft / Medium / Firm
Sleep Foundation: Best Mattress Overall Read review
$1,865RV King - 70x80 · list priceSee price
Keystone Alpine 3912DS mattress size
Main bed70 × 80 inRV king
That's an RV king, 6 in narrower than a regular king (76 × 80 in). A regular king won't fit, so get an RV king in exactly 70 × 80 in.
About the RV king size →Keystone 2024 brochure, 2024.
Mattresses in 70 × 80 in
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Best value
RVMattress.comCopperFlex Essential
- All-foam
- 6 in thick
- five comfort options
$799RV King - 70x80 · 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 - 70x80 · list priceSee price
Best hybrid
RVMattress.comCopperFlex RV Hybrid
- Hybrid
- 10 in thick
- Medium-Firm
$1,065RV King - 70x80 · 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 - 70x80 · 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 70 × 80 inGet a quote
The Alpine bedroom. Measure the platform, not the old mattress, before you buy.
The 3912DS floorplan
Keystone's 2024 3912DS floorplan.
Is this your 3912DS?
Check the year and length against your RV before you order.
| Year | Model | Length | Sleeps |
|---|---|---|---|
| 2023 | Alpine 3912DS | 43 ft 2 in | 6 |
| 2024 | Alpine 3912DS | 43 ft 2 in | 6 |
| 2025 | Alpine 3912DS | 43 ft 2 in | 6 |
Other Alpine mattress sizes
Sources
- Keystone (keystonerv.com): https://www.keystonerv.com/product/alpine/luxury-fifth-wheels/floorplans/3912DS
Questions
What size mattress is in the Keystone Alpine 3912DS?
The main bed is 70 × 80 in (Keystone 2024 brochure, 2024).