Well Gang
We've owned, modified, altered and towed, 9 different Jeep Wranglers over a 35 year period and well, can't say I've ever seen any cupping on any of the tires on the Jeeps. A zillion trips to Moab from San Diego, and from San Diego to Ouray CO and, really never seen any accelerated tire wear on any of them. The tow bar angles on any and all of them have been relatively level with one or two, being less than desired. We've had 31s, 33s and 35s on many of them, most of them All Terrains 'cause I absolutely despise mud terrains. So, can't advise anything here that might help the OP. If it were me, I'd not worry about it and go have fun. You're gonna have to change those jeep tires soon enough anyways from regular driving and Jeep use off road.
Scott