- Hybrid
- 13.25 in thick
- Soft / Medium / Firm
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That's an RV king, 4 in narrower than a regular king (76 × 80 in). A regular king won't fit, so get an RV king in exactly 72 × 80 in.
About the RV king size →2023 Forest River Fr3 brochure, 2023.
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Sleep Foundation: Best Mattress Overall Read review
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Some bunks have a rounded corner, so trace yours before a custom cut. A thicker bunk mattress takes headroom from the bunk above.
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| Year | Main bed | Bunks | Other beds | Source |
|---|---|---|---|---|
| 2020 | 72 × 80 in King | – | – | 2020 Forest River FR3 brochure |
| 2021 | 72 × 80 in King | – | Cab over 48 × 84 in | 2021 Forest River FR3 brochure |
| 2021 | 72 × 80 in King | – | – | Forest River spec sheet |
| 2023 | 72 × 80 in King | – | – | 2023 Forest River Fr3 brochure |
| 2024 | – | 48 × 84 in | – | Forest River spec sheet |
Years not listed weren't published.

Forest River's 2024 34DS floorplan.
Check the year and length against your RV before you order.
| Year | Model | Length | Sleeps |
|---|---|---|---|
| 2019 | FR3 Ford 34DS | 35' 11" | – |
| 2021 | FR3 Ford 34DS | 35' 11" | – |
| 2022 | FR3 Ford 34DS | 35' 11" | – |
| 2023 | FR3 Ford 34DS | 35' 11" | – |
| 2024 | FR3 34DS | 35' 11" | – |
| 2025 | FR3 34DS | 35' 11" | – |
| 2026 | FR3 34DS | 35' 11" | – |
The main bed is 72 × 80 in (2023 Forest River Fr3 brochure, 2023).
48 × 84 in (Forest River spec sheet, 2024).