I had uneven tire wear, with 7000km, alignment was fine, the camber was within jeep specs. After alot of running around (2 dealers) i got the following things fixed: the first dealer said that they put an offset balljoint in the front driverside (which had the worst tread of all 4 tires) and that fixed the problem.
but i had noticed that measuring from the flair to the ground, one side (the right) was higher than the other by an inch!!!
i freaked out. i though the frame was crooked, both dealerships said that this wasn't the case, it turned out to be that the body wasn't bolted on the frame exactly right and that's why the difference of an inch in hight. this might be irelavent to the tire tread, but again tha weught distribution of the frame was not what it should have been, so that might have been the initial problem... now at 17000km tire trad is perfect.
2001 Sahara, 31" Yokohama MTR