Below is an ad from The Albany,NY Craigs list. Might be worth looking into. I'm in no way connected with them but will be using them to solve my issue.
RV REPLACEMEMT MATTRESSES MADE TO ORDER - $250 (Cohoes)
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109 Remsen St
The Cohoes Mattress Company offers RV owners the opportunity to acquire custom sized mattresses for your RV of the type
and quality you would have in your home. Why continue to sleep on the low quality mattress that came with your RV? Why try and sleep on
a crummy mattress if you purchased your RV used? Why not enjoy staying in your RV when you are out on the road?
Our factory can custom size any of the mattresses we offer in our line up. This includes Firms, Plush, Pillow Tops and Viscious Memory Foam topped Sets.
Mattresses Start at $250. Our prices are way below the prices offered at an RV dealer. And our quality is 100 times better.
Come over and try one of ours at our factory showroom. We are open by appointment, so please call ahead
The Cohoes Mattress Co.
109 Remsen St.
Cohoes, NY 12047