- 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 →Jayco floorplan drawing, 2027.
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The Seneca Prestige bedroom. Measure the platform, not the old mattress, before you buy.

Jayco's 2027 33J floorplan.
Check the year and length against your RV before you order.
| Year | Model | Length | Sleeps |
|---|---|---|---|
| 2027 | Seneca Prestige 33J | 34' 2" | 7 |
The main bed is 72 × 80 in (Jayco floorplan drawing, 2027).