When we had the cushions redone in the vberth of our sailboat, the upholsterer recommended 3 inches of firm foam, topped with 1.5 inches of memory foam. I was skeptical, but he let me test out some cushions made that way, laying on a flat plywood bench to simulate the boat. After the test nap, I was happy. Works well.
In our trailer, we have 4" cushions, with a 2" fake "down" feather bed, and it works well for us, too.
We have found great buys (and supercheap shipping) on overstock dot com for mattress pads. Read the customer reviews, as they're extensive, and usually accurate.
Sherry
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