I have a ton of water damage in my bathroom. I pulled of the exterior panel to the hot water tank today and realized that the floor it sits on is completely disintegrated-to the point where the hwt is actually leaning to one side. I thought I could replace the floor with a piece of plywood but there isn't anything to nail it to! Since it's a mobile rebuilding the whole structure is not really an option. Any ideas from people with mobile repair experience?