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I would drill a dime size hole, fill the wall cavity with hard expanding foam and put a decorative cover over the hole if the antenna didn't cover. That will keep the wall from flexing when you run through-bolts to the plate you put on the inside of the wall.
This is how I fixed a torn out lower awning leg mount on my little nitrous toy hauler.
You can drill a hole slightly smaller than the bolt pattern and make a plug of wood to go between the walls if you don't like the foam idea.
I would first take off the cover plate for the upper seat belt adjuster that resides on the space between the slider and the window and see what's in there like a hellacious metal bar or wood beam I could attach to.
Yup, I'm sitting in the 24.1 doing mods and typing.
I'm right now building a cover for the exposed electrical panel in the cubby below the drivers seat. Laminate wiring diagram will be glued right to it....
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