I recently purchased an Avenger ATI. queen rv (short) mattress. factory mattress worst thing ever.
If you are in the area of Wichita Falls, Texas
go to or call on Furniture Mattress outlet
3911 Kell Blvd ste B
940-691-6146
they have 3 styles of mattresses construction
queen RV (short), pricing range from $200 - just under $300
1-2 week lead time, and came with a 10 year warranty
When I purchased our 5th wheel, I insisted the dealer install a quality full size residential queen mattress. It hangs over the platform 6inches, but doesn't hurt anything. It was well worth it!