- 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 →Forest River spec sheet, 2026.
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The Rockwood bedroom. Measure the platform, not the old mattress, before you buy.
| Year | Main bed | Bunks | Other beds | Source |
|---|---|---|---|---|
| 2020 | 72 × 80 in King | – | dinette 44in | Forest River floorplan drawing |
| 2021 | 72 × 80 in King | – | dinette 44in | Forest River floorplan drawing |
| 2024 | 72 × 80 in | – | – | Forest River spec page |
| 2026 | 72 × 80 in King | – | – | Forest River spec sheet |
Years not listed weren't published.

Forest River's 2021 8332SB floorplan.
Check the year and length against your RV before you order.
| Year | Model | Length | Sleeps |
|---|---|---|---|
| 2020 | Rockwood Signature 8332SB | 36' 8" | – |
| 2021 | Rockwood Signature 8332SB | 36' 8" | – |
| 2024 | Rockwood Signature 8332SB | 36' 8" | – |
| 2026 | Rockwood Signature 8332SB | 36' 8" | – |
The main bed is 72 × 80 in (Forest River spec sheet, 2026).