RHstansbury & Chuckleberry thanks! I'm running the Rough Country 2.5IN GM LEVELING LIFT KIT (07-18 1500 PU) comes with 2.5" up front and 1" of lift blocks over the factory. Seems to me like I'm sitting a bit nose high though. So I bought the 3" blocks and you need to buy the longer UBOLTS 9/16 to make it work. I didnt do any trimming at all! Thought I was going to have to cut some of the inner liner out but I can even run my mudflaps so pretty happy about that. Keep the rocks down.