Don't pull your air yet unless you know for sure that you will have to replace the whole roof. I found a bad spot on mine a couple of years ago and all I had to do was cut the rubber around about 6 inches past where I could feel was the rotted area. I then cut out the rot and replaced it with new luan board held down with small screws and liquid nails ,luan is a thin plywood that I got from Loews, then pulled the rubber section back over it and sealed it with 6 inch Eternabond tape and self leveling caulk. Fortunately only the top section of my roof was damaged, if yours is also damaged inside the trailer then it becomes a bigger project. Both of our trailers are probably built similar with fiberglass sides and a roof made of luan and Styrofoam with aluminum framing and another piece of luan all covered with either TPO or EPDM rubber. the walls are probably made the same except covered with fiberglass instead of rubber. I was lucky and only had to replace the top piece of luan. Good luck and welcome to the forum.
