I agree w wayward
Get a moisture meter and check the entire floor. Our plywood was wet and soft, rotten! You could poke a screwdriver right through it.
We had a bad leak in the rear area under the panoramic window and around the bumper area. Properly repaired the leaks, tore out everything, inc. the floor and sub floor. The vinyl Airstream uses is very thin and cheap. We sealed all areas & seams, installed insulation (there was none) under the new sub floor and a nice product, "Ceramatique", new floor. Beautiful. See our pics on my info pg.