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Gus,
I'm using two inch solid foam in the walls and ceiling, with 'Great Stuff' in the 2" square tube, 3/4 inch foam below 1/2 plywood on the floor, and probably some foam boards under the floor held on by glue/undercoating and clips. If I like the way it turns out, I'll probably re-do the insulation on the shop vans the same way.
I'm using two inch solid foam in the walls and ceiling, with 'Great Stuff' in the 2" square tube, 3/4 inch foam below 1/2 plywood on the floor, and probably some foam boards under the floor held on by glue/undercoating and clips. If I like the way it turns out, I'll probably re-do the insulation on the shop vans the same way.