Inside front tire wear.

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These trucks settle quite a bit on the frt suspension. When the frt suspension settles the camber gets more negative while the toe goes negative also due tot he camber change. Toe is the fastest tire wearing angle with camber being second and caster not really being a tire wearing angle.

I have done alignments and custom suspensions for right at 25 yrs and I always try to get 0.0 camber or a little bit positive and always toe the tires IN about 1/4" total. When the 99 model trucks first started coming out 2 local Chevy /GMC dealers were sending me their alignments cause their alignment guy couldnt figure out how to make the trucks get more than 20K out of tires.

Rotations are a must religously and I try to tell all my customers to rotate every 3000 miles for best results.Its well known that we all neglect to rotate on a reg basis as we are all too busy.