Do as you wish, but we simply purchased a quality off-the-shelf memory foam mattress topper for a queen-sized bed (to get the full 80" length) then used a pair of kitchen shears to cut it to fit. Not just the width and angled lower corner but also the slightly rounded outside upper corner that needs to be trimmed a bit to fit into the rounded corner of the camper shell. Also, others may want to chime in on this, but I believe, beginning nearly simultaneously with the new generation models, the mattress was manufactured 1" smaller in both horizontal dimensions (53" x 79"?) so as to leave a little breathing room between mattress and walls.
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