Originally Posted by caspery
I just opened the front banana wrap on my 73 and it looks identical to yours. I'm hammering out rock dents in the wrappers and wondering if I want to remove the entire belly. Were you just slithering around on your back to do all the work? What insulation are you using for new?
If you haven't pulled the belly pan yet to take a good look at the frame, then I would suggest you do. You just don't know what is down there in terms of rust and rot and its also a good idea to get rid of the old pink fiberglass that holds moisture up against the frame.
I used a mechanics creeper to roll on, the trailer sits on a concrete apron besides the garage. You could also put some cardboard or plywood down, especially if the trailer is sitting on grass or gravel.
For insulation I used some closed cell foam board that I got at HD. I used 3/4" and doubled it up to 1.5" for an R value of about 8. It is held up with 2" decking screws and fender washers that go into the subfloor. I think it does a pretty good job and it wont hold any moisture against the frame. It may help make the trailer a bit quieter too, but thats subjective.
One bit of advice though, be careful if you are wirebrushing the rust on the frame while you are on your back. I was wearing wrap around safety glasses and still managed to get a small speck of rust in my left eye. It was not a fun experience and not cheap either with what they charge for specialist copays.