4X4

Cooper Discoverer S/T MAXX - http://www.chevysilverado1500.com/cooper-discoverer-st-maxx-tires.php
A true all-terrain tire that splits the gap between the AT tires and the more aggressive mud terrain tires.

Pro Comp Xtreme MT - http://www.chevysilverado1500.com/pro-comp-xtreme-mt.php
Pro Comp XTreme MT tires take no prisoners on or off the road.