If I were "planning to go all the way through the trailer wall with bolts, I'd drill the hole, use carriage bolts with the "rounded head on the inside of the trailer" and install washers and nylocks on the outside, then grind the bolts off so they are even with the base of the nylock, inside the awning "C arm".
That would provide the "smoothest surface" on the inside of the trailer. A "raw bolt with threads" or a "nut/washer/bolt" on the interior wall will always be a "skin cutter" for anyone coming close to that area, and inside any RV, there's "close quarters" that make it even a more frequent potential to get a scrape/cut from something hanging out of the wall.....
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John
2015 F250 6.7l 4x4
2014 Cougar X Lite 27RKS
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