- Hybrid
- 13.25 in thick
- Soft / Medium / Firm
Sleep Foundation: Best Mattress Overall Read review
That's an Olympic queen, 6 in wider than a regular queen. RV mattress sellers stock it; a regular queen would leave 6 in of platform bare.
Keystone spec page, 2027.
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Sleep Foundation: Best Mattress Overall Read review
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The Springdale bedroom. Measure the platform, not the old mattress, before you buy.

Keystone's 2027 31SUNROOM floorplan.
Check the year and length against your RV before you order.
| Year | Model | Length | Sleeps |
|---|---|---|---|
| 2026 | Springdale MAX 31SUNROOM | – | – |
| 2026 | Springdale Max 31SUNROOM | 35' 11" | 4 |
| 2027 | Springdale MAX 31SUNROOM | – | – |
| 2027 | Springdale Max 31SUNROOM | 35' 11" | 4 |
The main bed is 66 × 80 in (Keystone spec page, 2027).