Custom size
- Hybrid
- 8 in thick
- cushion-firm
Sleep Foundation: Best Mattress for Pressure Relief Read review
Made to 54 × 74 inGet a quote
That isn't a standard mattress size, so order a custom size cut to your platform.
About the RV full size →Forest River spec sheet, 2026.
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Sleep Foundation: Best Mattress for Pressure Relief Read review

The Flagstaff bedroom. Measure the platform, not the old mattress, before you buy.
| Year | Main bed | Bunks | Other beds | Source |
|---|---|---|---|---|
| 2021 | 54 × 74 in Full | – | – | 2021 Forest River Flagstaff E Pro brochure |
| 2021 | 54 × 74 in Full | – | – | Forest River spec sheet |
| 2022 | 54 × 74 in Full | – | – | 2022 Forest River Flagstaff E Pro brochure |
| 2022 | 54 × 74 in Full | – | – | Forest River spec sheet |
| 2026 | 54 × 74 in Full | – | – | 2026 Forest River Flagstaff Travel Trailers brochure |
| 2026 | 54 × 74 in Full | – | – | Forest River spec sheet |
Years not listed weren't published.
Check the year and length against your RV before you order.
| Year | Model | Length | Sleeps |
|---|---|---|---|
| 2021 | Flagstaff E-Pro E20FBS | 21' 2" | – |
| 2022 | Flagstaff E-Pro E20FBS | 21' 8" | – |
| 2026 | Flagstaff E-Pro E20FBS | 21' 2" | – |
The main bed is 54 × 74 in (Forest River spec sheet, 2026).