Custom size
Mattress InsiderLuxury Gel Memory Foam
- Memory foam
- 8 in thick
- not stated
Made to 60 × 78 inGet a quote
Grand Design Imagine XLS 21MBE mattress size
Main bed60 × 78 inCustom size
That isn't a standard mattress size, so order a custom size cut to your platform.
Grand Design spec sheet, 2027.
Bunks47 × 76 in
Bunk. Grand Design spec sheet, 2027.
Common RV bunk sizes →
Mattresses in 60 × 78 in
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Bunk mattresses in 47 × 76 in
Some bunks have a rounded corner, so trace yours before a custom cut. A thicker bunk mattress takes headroom from the bunk above.
Custom size
Mattress InsiderLuxury Gel Memory Foam
- Memory foam
- 8 in thick
- not stated
Made to 47 × 76 inGet a quote
The Imagine XLS bedroom. Measure the platform, not the old mattress, before you buy.
Bed sizes by year
| Year | Main bed | Bunks | Other beds | Source |
|---|---|---|---|---|
| 2026 | – | 47 × 76 in | – | Grand Design 2026 model-year brochure |
| 2026 | 60 × 78 in | 47 × 76 in | – | Grand Design spec sheet |
| 2027 | 60 × 78 in | 47 × 76 in | – | Grand Design spec sheet |
Years not listed weren't published.
The 21MBE floorplan
Grand Design's 2027 21MBE floorplan.
Is this your 21MBE?
Check the year and length against your RV before you order.
| Year | Model | Length | Sleeps |
|---|---|---|---|
| 2026 | Imagine XLS 21MBE | 24' 11" | 5 |
| 2027 | Imagine XLS 21MBE | 24' 11" | 5 |
Other Imagine XLS mattress sizes
Sources
- Grand Design (granddesignrv.com), archived copy: https://web.archive.org/web/20260416013122/https://www.granddesignrv.com/travel-trailers/imagine-xls/21mbe
- Grand Design (granddesignrv.com): https://www.granddesignrv.com/travel-trailers/imagine-xls/21mbe
Questions
What size mattress is in the Grand Design Imagine XLS 21MBE?
The main bed is 60 × 78 in (Grand Design spec sheet, 2027).
What size are the Grand Design Imagine XLS 21MBE bunk mattresses?
47 × 76 in (Grand Design spec sheet, 2027).