Hi,
You lasted longer than I did. I found myself replacing the mattress in about 1 month of ownership. It is just a standard issue crap mattress and I don't think it is uncommon in RV's. My last RV had a 4" thick foam mattress. It also was replaced quickly.
The best option would be to measure and go to the store and buy really good mattress.
I went to Amazon and found one I could afford ($80 or 120). It is not the best either, but a heck of a lot better than the OEM. It fits just a hair snug, but works fine. I rotate it every two weeks and my back thanks me.
I found a flannel sheets set at Walmart for $30-40, they also fit just fine.
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