My OFF-ROAD POPUP Trailer sure had a thin mattress in the tent bed ends... I added three inch memory foam to those but then ran into what happens to memory foam and memory foam pillows when the temps goes down to freezing...
It seems they get hard as a rock when the temps go down haha...
If you are laying in the bed when this happens then when you get up there is a deep compression of you laying in bed until it all warms up...
I never knew memory foam did that...
This added three inches to the mattress also just barely fits now when the roof is lowered for travel... Used to lay things on the bed for storage before that haha...
Roy Ken