The wife did not like the mattress laying directly on the raw plywood and it made it hard slide it to make the bed. I picked up a $20 indoor/outdoor 5x7 carpet at Lowes, cut it to fit and stapled it on top of the plywood. Makes the mattress easy to move and it helped on the insulating and condensation issue. I still want to put something in the storage compartment to help out a bit more though.
We don't often camp in really cool or cold weather but when we do I would think a little more insulation would go a long way. My unit has the bonded foam walls and aluminum frame and is supposed to be an all weather camper but any help I can give it the wife will think I am a hero.