- Hybrid
- 13.25 in thick
- Soft / Medium / Firm
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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 →2026 Forest River Flagstaff Tent Campers brochure, 2026.
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The Flagstaff bedroom. Measure the platform, not the old mattress, before you buy.

Forest River's 2026 227MT floorplan.
Check the year and length against your RV before you order.
| Year | Model | Length | Sleeps |
|---|---|---|---|
| 2026 | Flagstaff MAC 227MT | 18' 7" | – |
The main bed is 70 × 80 in (2026 Forest River Flagstaff Tent Campers brochure, 2026).