Has anyone ever cut out a section of their trailer's under belly to gain access to plumbing, etc.? If so, how did you reattach it? The covering on my trailer is a sheet of flexible rubber.
Had the same problem on out T/T a few years back, I used a strip of galvanized pipe strap, from one side to the other secured with self tapping screws, and covered the actual "cut" with Gorilla Tape. Kept a check on it from time to time to make sure it was holding. Good Luck and Happy Camping !!