- Memory foam
- 8 in thick
- not stated
That isn't a standard mattress size, so order a custom size cut to your platform.
Highland Ridge website floorplan drawing, 2026.
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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.
Sleep Foundation: Best Mattress Overall Read review

The Open Range bedroom. Measure the platform, not the old mattress, before you buy.
| Year | Main bed | Bunks | Other beds | Source |
|---|---|---|---|---|
| 2023 | 60 × 80 in King | – | – | Highland Ridge website floorplan drawing |
| 2024 | 60 × 80 in King | – | – | Highland Ridge website floorplan drawing |
| 2025 | 60 × 78 in King | – | – | Highland Ridge website floorplan drawing |
| 2026 | 72 × 78 in King | 28 × 74 in, 38 × 74 in | – | Highland Ridge website floorplan drawing |
Years not listed weren't published.

Highland Ridge's 2026 338BHS floorplan.
Check the year and length against your RV before you order.
| Year | Model | Length | Sleeps |
|---|---|---|---|
| 2022 | Open Range 338BHS | 39' 10" | 9 |
| 2024 | Open Range 338BHS | 39' 5" | 9 |
| 2025 | Open Range 338BHS | 39' 6" | 9 |
| 2026 | Open Range 338BHS | 39' 6" | 10 |
The main bed is 72 × 78 in (Highland Ridge website floorplan drawing, 2026).
28 × 74 in / 38 × 74 in (Highland Ridge website floorplan drawing, 2026).