One method that I have seen but no idea if it fits your RV?
Some have a track attached to the bottom rear of tv which sets into a track on the wall.
At the top rear there is a second track on the TV with another metal strip screwed to the wall to keep the TV from tilting forward.
Maybe this drawing makes more sense if you think of looking at the TV from the side?
The one we had was a bit of trouble to get loose as the screws were very nearly too far down behind the TV top to get a screwdriver into remove them.
Maybe run fingers along the top back side to feel for screw heads?
Or if you can get a look from the side, maybe spot if this guess is anywhere close to what you have?
An inspection mirror or one of the endoscopes for attaching to phone would be handy for peeking behind.
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Richard
Why no RV year, make and floorplan on MY signature as we suggest for others?
I currently DO NOT have one!