Thor Quantum LX19 mattress size
Years 2026–2027Sold as QuantumLength 21'-3"Sleeps 3
Bunk mattresses in 52 × 91 in
Some bunks have a rounded corner, so trace yours before a custom cut. A thicker bunk mattress takes headroom from the bunk above.

Mattress InsiderPark Meadow Encased Coil II
- Hybrid
- 8 in thick
- cushion-firm
Sleep Foundation: Best Mattress for Pressure Relief Read review
The LX19 floorplan

Thor's 2027 LX19 floorplan.
Is this your LX19?
Check the year and length against your RV before you order.
| Year | Model | Length | Sleeps |
| 2026 | Quantum LX19 | – | – |
| 2027 | Quantum LX19 | 21'-3" | 3 |
Other Quantum mattress sizes
Questions
What size are the Thor Quantum LX19 bunk mattresses?
52 × 91 in (Thor spec sheet, 2026).