the insulation on the underside of the mattress may not be necessary for me, but I know I am going to use the idea of the foam inside the underbed storage. I also really like the idea of insulating the inside of the nightstand from the pass through compartment idea.
I was in my TT over Thanksgiving and temps got pretty low, especially as I had a gas line leak and couldn't use furnace. (I did have electricity so an electric blanket and electric heater got me by.) Anyhow, one night, the nightstand top got cold enough my cell phone wouldn't charge or stay on. So I guess my next project is definitely insulating the night stand and inside of pass through.
Question... what type of adhesive are you using to attach the foam to the wood dividers? are you using the same type on the doors? Can someone post a picture of how you did the door?