I put the rough country kit on my 03 z71 a few weeks ago. here are a few pics i now run a 325 50 20 but in the pics its sitting on 275 55 20's i sit at 40 and a half inches all the way around. last pic is before lift

 

I spoke with RC, they are sending me a set of 4 new Performance 2.2 series shocks. Once I get them installed and run them for about a week to get a good average of riding conditions I will let you know the outcome.