Aren't the suspensions of the SS and the Denali the same as any 4x4 1500 4x4 other than the transfercase? I believe they use the same cv's as well, but I'm sure having power to them at all times gives some size limitations. I would say stick to a fulldrop lift to keep the angles flat like the others had said and don't go any bigger than 35's. There was a custom shop by my old house that did a few lifted SS's. I believe that shop was all about Fabtech lifts.