Friend of mine just bought an 04 2500HD Duramax. He also bought 20" rims with some 34.5" tires. With the offset of the rims he rubs just a tad with 1500 keys already cranked. He uses it for towing so it has a class 5 hitch on it, which is going to rule out a body lift. What other options does he have for clearance. I was curious about the Cognito leveling kit but I don't know if it will give him the clearance.