I have a 2010 silverado. I had a 3.75, 3.5 is what it may be called, rc suspension lift on 33in trail grapplers w/ 18 inch rim. I recently put a 3 inch zone body lift on and bought a set of 325/65/18 (35/12.50) fierce attitudes. I know my truck requires at least 6 inches of lift to clear 35s, this set-up should provide 6.5 but is there a difference between my set up and let's say a 6 inch procomp? I'd hate to put them on and them not fit. That was the main reason for the body lift.