Why not cardboard?
In the beginning of the season I load it up with condiments, ice in freezer, frozen pizza etc.. obviously the perishables,bread and etc.. before we leave. I just leave the fridge on all season. Winter i remove all food, dry out fridge, Winterize camper. However I have been leaving all my cloths, soap, games, dishes, blanks, sheets etc.. basically everything except food. Haven't had any issues with it. I also put one of those damprid thing in there. Put cushions on edges and leave the clothes cabinet doors cracked open. Don't know if what i do is right but so far has worked well for me. Interested in seeing what other people think..
2014 6.6L Duramax 2500hd CrewCab
2018 5th wheel on its way
2011 x23b (sold)
05 f150 5.4 v8 (sold)