I have a 2002 z71 tahoe with keys in the front. i am currently clearing 35 12.50x17 nitto mud grapplers. I am wanting to put 35 12.50x20 nitto mud grapplers on it. I know I can clear them with 6" of lift but I want as little lift and as much tire and rim as I can fit. Any suggestions on what I could do to clear them without going to a 6" lift?