We added a 3" Sleep on Latex topper to our mattress and it has worked out very well. DW has gone through a couple iterations for our bed at home and ended up with the Sleep on Latex so we got one for the RV. They custom cut a mattress topper for the RV mattress as they aren't standard bed sizes. I think it cost about $15 extra plus they sent us the cut off section that she has used to make a couple of pillows. They also make foundation mattresses, which we found we didn't need for the RV. At home we have a 9" mattress and a 3" topper. The toppers come in 1, 2 and 3 inch thicknesses.
https://sleeponlatex.com/?gclid=Cj0K...EaAhJ2EALw_wcB
We used a foam topper from Costco for a few years, but she was finding it too be too hard and didn't like the smell from off-gassing. The Sleep on Latex doesn't have those issues.
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