Yesterday I noticed the rear passenger tire is extremely worn, less than an 1/16" of tread left compared to the two front tires that have over 3/8" of tread. I bought this 2004 Wrangler in June and all four tires looked new (tread was all the same depth). The rear driver's side tire is also worn more than the front two, but probably only half as worn as the rear passenger tire. Unfortunately, I'm going to have to purchase at least 1 new tire to replace the worst one, but my bigger concern is the cause of the uneven wear! Could this be as simple as just needing an alignment, or could it be more serious? I guess I'm asking for some inputs as to what to expect when I take it in the garage to have it checked out. Also, on an issue such as this, should I take it to the dealer, a tire shop, or some place like 4 Wheel Parts were they work on Jeeps all the time? Thanks for the help, and Happy New Year!