I bought some sheet foam insulation (3/4", I think) to cover our side A/C hole. I cut it to size, and then covered it all around with wood-grained looking contact paper. It fits quite well inside the hole, stays put easily, and is simple to take in and out. When not in use it can be stowed under one of the bed mattresses. The contact paper helps hold it together so it doesn't let off those little styrofoam pieces and make a mess.
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'97 2720 & '01 Chevy Silverado 1500 4x4
2011 & 2017 Prii, 10'x18' & 10'x9' Tents
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