"biggest concern to me is the trailer jack hitting the camper on a tight turn. Set it up and make a tight turn with a spotter to make sure you can corner as tight as you feel you will need to on the road without any part of the trailer hitting the camper "
Exactly, that is my concern too. For me to do this mockup, I would need to go out and buy one of the systems and try it out ( feasible, not costly). Maybe start with the 16" ball hitch and buy a an extension to make up the difference.
What I'm really concerned about using extensions are all the parts that add to weak points. What I would rather have is one single shaft that is both the extension and the ball. And where I can add chains and tensioners off the ball side to the outer part of the hitch on the truck. But it doesn't exist, I would need to have this custom-made or upgrade to a 2.5" hitch