Great all around
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 Avalanche 338GK 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 2022 brochure, 2022.
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
Firm
RVMattress.comPlank Firm Luxe
- Hybrid
- 13 in thick
- Firm / Extra Firm
$1,865RV King - 70x80 · 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 - 70x80 · list priceSee price
RV hybrid
RVMattress.comCopperFlex RV Hybrid
- Hybrid
- 10 in thick
- Medium-Firm
$1,065RV King - 70x80 · list priceSee price
Custom size
Mattress InsiderLuxury Gel Memory Foam
- Memory foam
- 8 in thick
- not stated
Made to 70 × 80 inGet a quote
The Avalanche bedroom. Measure the platform, not the old mattress, before you buy.
Bed sizes by year
| Year | Main bed | Bunks | Other beds | Source |
|---|---|---|---|---|
| 2021 | 70 × 80 in King | – | – | Keystone 2021 brochure |
| 2022 | 70 × 80 in | – | – | Keystone 2022 brochure |
Years not listed weren't published.
The 338GK floorplan
Keystone's 2026 338GK floorplan.
Is this your 338GK?
Check the year and length against your RV before you order.
| Year | Model | Length | Sleeps |
|---|---|---|---|
| 2020 | Alpine Avalanche Edition 338GK | 37 ft 11 in | 4 |
| 2021 | Alpine Avalanche Edition 338GK | 38 ft 0 in | 4 |
| 2022 | Alpine Avalanche Edition 338GK | 38 ft 0 in | 4 |
| 2023 | Alpine Avalanche Edition 338GK | 37 ft 11 in | 4 |
| 2024 | Alpine Avalanche Edition 338GK | 37 ft 11 in | 4 |
| 2025 | Alpine Avalanche Edition 338GK | 37 ft 11 in | 4 |
| 2026 | Alpine Avalanche Edition 338GK | 37 ft 11 in | 4 |
Other Avalanche mattress sizes
Sources
- Keystone (keystonerv.com): https://www.keystonerv.com/product/alpine-avalanche-edition/luxury-fifth-wheels/floorplans/338GK
Questions
What size mattress is in the Keystone Avalanche 338GK?
The main bed is 70 × 80 in (Keystone 2022 brochure, 2022).