I'm looking at getting a set of H2 wheels and putting 33X12.50R17 Mud Grapplers on my truck. The truck is a 05 2500hd Dmax the only mod to the suspension is a leveling kit and I'm just curious what else needs to be done to keep from rubbing.

Trimming of the lower valance and a small amount to the inner fender plastic and you should be good.