4000 miles with my 15s", and no problems so far. I have the standard axle for a 2003 (22 1/2 degree), but have the 2 1/2" lift kit. I stayed with a C rated for smoother ride, but still gained 560 lbs. of additional carrying capacity "cushion" over the C rated 14s. I am very happy with the changeover to 15s.
Beware that you will probably have to modify your spare tire rack to accomodate the slightly wider tire.
Chap
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