Ron,My primary purpose to adding insulation was to make the floor that I walk on without shoes warmer in cold weather.
I didn't insulate anything else. We do travel in cold weather in the dead of winter but usually only for a few days and have never had the need to do more than what I've done.
A lot depends of personal usage.
Ron
What foam and glue did you use? What paint?
I am leaning towards blue xps foam since I have a bunch.