I used 1" self tapping metal screws. i mounted a TCL 32" Roku TV. The mount I used was a simple bar mount with a slight down tilt. Works perfect. About $12 at Wally World. The walls are supposed to be 1 1/2" so wanted to make sure didn't come out the outside! That would just ruin your day!! Here is what you look for on their web site. I use this and the TV travels fine with no problem but with the pulling of the two pin releases I take it outside and mount it on a similar bar mount on a TV tripod for viewing outside if desired! Simple. I just would not put holes in the side of the RV to mount a TV mount.
Mount-It! Low Profile Fixed TV Wall Mount, Fits 32"- 55" Tv's, Capacity 77 lbs., Made from solid high-strength steel, Lifetime Warranty,