CUTTING A HOLE IN TT DOOR? {{{{{UPDATES}}}}}}

Travel trailer entry doors made since the 1990s are nothing more than a perimeter frame and a laminated sandwich of foam with a thin fiberglass or aluminum skin. A few if older may have a 1/8" Luan plywood layer. There will not be any stud or other structural support in the center. The RV manufacturers that don't use doors with windows do so to lower costs. There is no perimeter framing at the window, or inside a door without windows just the same as there is not perimeter framing at other window openings in a laminated trailer. You could cut an opening in an RV entry door with a sharp utility knife if you had nothing else.