I bought a fitted full-sized sheet for the front bed & it fits OK. Maybe a knitted sheet (jersey?) would give you some more flexibility and stretchiness. Our mattress fits so snugly in there that any overlap could be tucked in easily.
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'97 2720 & '01 Chevy Silverado 1500 4x4
2011 & 2017 Prii, 10'x18' & 10'x9' Tents
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