that would have to be some serious over inflation. and PO says 30psi, so we know that surely isn't the case..... Maybe something is affecting the alignment causing the tire to be dragged along so to speak (effectively scrubbing it), but then maybe you'd see that something was out of alignment that bad? and why would it scrub the center if it's only running 30psi?
I've seen it on an old van my dad had, which was way different than a Jeep, but that was a bent axle shaft. Threw oil all over and scrubbed the tire in figures few......
Like I said, the Jeep is a different beast entirely with far more components in the mix, so by no means am I offering a diagnosis. Just my thoughts.
Any thoughts after having pics to evaluate? I need to get this issue fixed before getting new tires. If it is a rotation problem I won't take it in but if I'm looking at bent axle or suspension I need to have a mechanic look at it before I get tires.
It wouldn't hurt to have things checked out... Probably putting it on in the alignment machine would give you a better idea if the axle is out of alignment? Maybe also try jacking it up and see if you can wiggle the wheels maybe the wheel bearings are bad?
if it were me, I would take it to a tire shop and buy 5 new tires and get an alighnment. If it needed other items like shocks i would address those issues too. I would then have starting point to work with. A good tread depth gauge and pressure gauge are must haves for me.
I have a couple pressure gauges. I usually just use a coin for tread tho. What pressure should I run on the street? I have 30psi in all corners. This is what I usually run in all my cars but I have seen that most AT tires say 50psi. Am I under inflated? I have 30x9.5 but with a load they only measure 28" tall.