- 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 floorplan drawing, 2020.
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The Rockwood bedroom. Measure the platform, not the old mattress, before you buy.

Forest River's 2020 8328SB floorplan.
Check the year and length against your RV before you order.
| Year | Model | Length | Sleeps |
|---|---|---|---|
| 2020 | Rockwood Signature 8328SB | 36' 8" | – |
The main bed is 72 × 80 in (Forest River floorplan drawing, 2020).