Looking for affordable recommendations for an affordable bedding solution for my 14x7.5 cargo trailer that'll be comfortable for my girlfriend an I.
Currently I'm using a queen sized air mattress on a collapsable cot platform type thing, but it's too big & uncomfortable... I want to get away from fragile air mattresses and air pumps.
I'm considering something like a 4" foam mattress topper on a plywood platform that I can mount on a piano hinge to fold up against the wall, but I question whether or not a foam mattress topper will be firm enough?

Reason for thinking about foam is I will order it in a full size, then trim a few inches off the side to fit in the amount of wall room I have (50" wide vs typical 54" for a full size mattress)
Any recommendations?