You are not going to like the answer.
Not only are the walls hollow, they are only 3/32 inch thick plywood.
The mount without the TV would pull out over time.
If you can catch an aluminum tube, you might (and I am not confident) get away with it, but that aluminum is SOFT.
One way to beat the Interior RV wall issue is similar to the way they fish bolts through frame holes. Attach a wire to a small 3/4 inch thick block of plywood (just big enough to fit through the AC outlet hole) and "fish" the block to where you want to put one of the mounting screws. Have a friend (using flat head screws) screw fasten the block of wood to the back side of the interior wall. Do another block for the lower arm mounting screws. Then you will have a sturdy wood substrate to screw into and spread the weight over a large 2x3 inch say block of wood.
Exterior walls are filled with Styrofoam and need to be blocked during construction.
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Lou & Freya the wonder dog
2008 GMC Sierra 3000HD Allison Duramax
2019 Flagstaff 8529FL
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