Hey folks I'm new to this site. I've done a lot of off road camping and hunting, and just did a 10,000 KM solo Adventure bike trip through the Arctic. I just picked up this 2001 F550 With a 12' cab over van body already. I have lots of ideas already but the first is what to use to insulate the inside? It already has some insulation between the aluminum and the plywood on the inside that is similar to insulation in a truck cab. It's about 3/8" thick. We do lots of winter camping up to -20 so that won't be enough. Any suggestions would be appreciated. Here is my start point.