Thank you for the tour! I'm going to use your idea for the quick disconnects on the awning. I have the shorter awning mounted on the rear of the UM.
We just bought a used '17 JKU with the Ursa Minor about a month and a half ago. Still trying to figure out the acrobatics of two people in and out of the sleeping area. lol
Perhaps an idea to consider as an option to the hitch mount carrier; When I made the rear bumper and tire carrier for my CJ7, I made a rack that attaches to the tire carrier. That way, it doesn't have to be removed to access the tailgate area. It would be a little higher, so it would also improve your departure angle.
When I "designed" this tire carrier, I made it so the weight of the tire is carried by the two tubes, and stabilized by the mast. The two tubes also act as receivers for the cargo rack. I thought I had a pic, but I don't. The rack is essentially comprised of two tubes of a dia. to slide into the carrier with a platform (I had some aluminum honeycomb material) fastened to the tubing, and aluminum angle to form the perimeter and add rigidity. A pin thru each tube keeps it in place. It's strong enough that I have carried a two stage snow thrower on it as well as four mounted 33" tires.
As a side note, I also made a bike rack that slides into the top of the mast. Can't really use both together, though.