I have a Weekend Warrior Super Lite 5th Wheel. The floor was rotted away at the entrance (side) door in area about 30 by 20 in. It's a strange place since there is no plumbing there, although it...
Our Victory Lane let water in a side hatch. No way for it to get out so the fibreglass insulation below the floor held the wet. I was able to pull out handfuls of ex-plywood.