I agree with twopro - it sure looks like you got a problem with the roof.
If that was mine, and IF that roof hasn't made this into the project from... h-e double toothpicks, I would personally replace all the fabric (curtians, pillow and cushion covers, bedspread) and wall paper on the inside - which would be reasonably easy and make a serious improvement on appearance. The outside is a little hard to judge based on the pictures provided, but I would keep the pattern (wide color stripes and wide white stripes) and paint the color strips to match my truck.
Just my $0.02