When i first bought my truck and camper, intended to mount a permanent connector in the bed wall, but had so many other things to figure out at the time I punted and just made a 6 awg pigtail with split loom over it that comes over the top of the front bed wall. I used an SB50 connector with the optional rubber environmental boots. I stow the pigtail under the bed when the camper is off for a long period.
I decided I like it that way and that is now my permanent method. The connection is completely out of sight, and the wires coming over the front wall are not noticeable unless you look for them.
This what i did also, I use a reusable zip tie to stow it. Plus since I didn’t drill my bed, if I replace the truck or sell
camper, I can just pull the wires and reuse.