Custom size
Mattress InsiderPark Meadow Encased Coil II
- Hybrid
- 8 in thick
- cushion-firm
Sleep Foundation: Best Mattress for Pressure Relief Read review
Made to 66 × 74 inGet a quote
Keystone Hideout 123BB mattress size
Main bed66 × 74 inCustom size
That isn't a standard mattress size, so order a custom size cut to your platform.
Dealer report, 2026. A reported size, not a guarantee: measure your platform first.
Mattresses in 66 × 74 in
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The 123BB floorplan
Keystone's 2027 123BB floorplan.
Is this your 123BB?
Check the year and length against your RV before you order.
| Year | Model | Length | Sleeps |
|---|---|---|---|
| 2026 | Hideout Mini 123BB | 15 ft 11 in | 4 |
| 2027 | Hideout Mini 123BB | 15 ft 11 in | 4 |
Other Hideout mattress sizes
Sources
- Keystone (keystonerv.com): https://www.keystonerv.com/product/hideout-sport-single/comfort-travel-trailers/floorplans/123BB
Questions
What size mattress is in the Keystone Hideout 123BB?
The main bed is 66 × 74 in (Dealer report, 2026).