Assuming your TT has a fiberglass exterior, simply take the screw out and use a fiberglass repair kit (with color gelcoat) from a marine store. Just try and match the color as close as possible and follow the directions on the repair kit. Is there a mounting plate somewhere in your TT for a TV mount? Call the manufacturer and ask where to mount one. If that doesn't work, my only suggestion would be to make one yourself. Find studs (either metal or wood) and mount a plate (1/2 in plywood - good quality) between them attaching both ends to the studs and using a high quality adhesive on the surface in between. Then mount your bracket to that. I am not an RV repair man and have no inside experience except I've owned a few over the past 50 years. Good luck...don't give up, we ALL make a mistake here and there ?