Just bought a 1997 1500 reg cab, short box Sport, 5.2 auto with 60k on it. It has the goodyear wrangler 265/75-16's. I used to own a 97 ext cab and then a 2001 ext cab and they all had the goodyears. I noticed that all these front tires "cup" but the right front on this particular truck cups more severely than the other. Has anyone else had this problem and is it possible that the right front auto-lock hub is not disengaging? It's chewing this tire up pretty good.

 

Check the ball joints. Seen a truck the had abnormal tire wear and the upper ball joint was bad.

 

Or just the alignment. Or a lack of rotating, but I'd go with alignment out of spec perhaps caused by violent impact (curb or crash) or a part wearing out.