[Motor31]

You might want to rethink sealing the roof vents. No matter how good the seal in the ceiling there will still be moisture from normal living action gathering in there. That would be a perfect place for mold to develop. The venting will at least allow some drying action instead of pooling of moisture.

The insulation used in these rigs WILL settle. Since they use loose fiberglass insulation it will settle in the walls and in the attic area. The older and more miles the rigs get the more the insulation will settle. In the case of the walls it will leave gaps in the walls with no insulation. Gravity will assert it's influence over time since the fiber glass is loose and there is nothing but a minimal amount of glue on one surface of it.