For the time and money it would take to make something like this the gowithoutdoors cart is a bargain at that quality level. I might get one for taking on vacation so I have a doors off storage solution when I’m away from my garage.
None of this is new. There is a USB-C port in the 2018 JL.
My wife’s 2018 JLU Sahara.
If you must, then buy a USB-C adapter on Amazon.
USB C Female to USB Male Adapter 2 Pack,Type A Charger Cable Power Adapter...
Did you post in the Gladiator forum? A lot of people are looking for a single to get a five wheel set…if you wanted to entertain that. I’ve seen people offer $75-100 for a single. You’d make more $ that way.
This is the way I went to tap the courtesy light for an Oracle install—no chance for screw-ups. Easy to route, no problems.
EDIT: I should add that I did mine this way because there is almost no room in the engine bay to get through if you have a diesel.