There's any number of companies that can custom cut various thicknesses and firmness of foam. We put a mattress topper on ours and on top of that a sleeping bag flat out. It's pretty comfortable.
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Chuck
2013 Jayco Jayfeather X20 E (sold)
2016 Chevy Silverado LTZ 2 Z71 Crew Cab (sold, and dearly missed)
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