- 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, 2025.
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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 |
|---|---|---|---|---|
| 2021 | 72 × 80 in King | 30 × 73 in | – | 2021 Forest River Berkshire XLT brochure |
| 2021 | 72 × 80 in King | – | – | Forest River spec sheet |
| 2022 | 72 × 80 in King | 30 × 73 in | – | 2022 Forest River Berkshire XLT brochure |
| 2023 | 72 × 80 in King | – | – | Forest River spec sheet |
| 2025 | 72 × 80 in King | – | – | 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 | Berkshire XLT 45CA | 44' 10" | – |
| 2022 | Berkshire XLT 45CA | 44' 11" | – |
| 2023 | Berkshire XLT 45CA | 44' 11" | – |
| 2024 | Berkshire XLT 45CA | 44' 11" | – |
| 2025 | Berkshire XLT 45CA | 44' 11" | – |
The main bed is 72 × 80 in (Forest River spec sheet, 2025).
30 × 73 in (2022 Forest River Berkshire XLT brochure, 2022).