We did that in our motorhome so we have the 72"x 80" in the bedroom slide that was originally a queen. We got a Comfort Air mattress with a memory foam topper. It's a great place to sleep! I think you will be happy with the king size mattress.
One thing you may want to look at is replacing the plywood rather than covering the existing plywood. With two pieces of plywood it may be too heavy to lift and stay up to access the under bed storage. If you do not have under bed storage then it might not make any difference.
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Terry
'05 Dutch Star 4015- all new exterior in 2015, '16 Rubicon OlllllO, & HD Ultra ElectraGlide, NKK14278L
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