I have a 17-year old 21-ft expandable trailer that has held up pretty well especially since I store it indoors during the winter. However just before storing it last year, I noticed that there had been a leak in the front storage area.
Apparently the outside seam had come loose and water had seeped inside. The floor cross member at the front had partially rotted and some of the 1/4" plywood under the floor tile. In the meantime, i made sure that the seam was caulked since the screw will no longer hold it to the chassis.
The leak was only on one side and so only about 1/4 of the cross-member and floor is affected.
Other than removing the benches and ripping out the affected cross-member and replacing it, any advice on repairing that part of the floor? I was thinking of just putting a new piece of 1/4" plywood over the affected area and then re-tiling.