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Interesting that you would mention the CST and Rancho 4" kits as I was looking at them both for my '13 Z71. That is about all I can go and still get into the downtown parking garage since this is my daily driver. I presently run Terra Grappler 285/60R18E on Fuel Trophy D552 18"x9" wheels. I'm also thinking of going to 305/60 or even 325/60 G2 and figure I will need the 4" especially for the 325's.Get a level kit lift and Bilstein 5100s. The front shocks automatically lift the fron an 1" but are adjustable so maybe only need a 1/2" spacer to mount on bottom. This giving the front 2-2.5" of lift which is fine for stock angles. Then get a 1-1.5" rear coil spacer. If you want 4" go with Rancho or CST any bigger go 7" FTS or McGaughys