Guess on tire size
305 60 R20 is around 34". I am guessing 33" or 34" tires on that rig. Personally I think an 18 inch wheel looks much better on the Tahoes and Yukons. I put 20's on a 2000 Yukon and the proportions always seemed off, especially since you (like me) prefer the look of the original Z71 you posted. I think if you did the newer Silverado rims with the black center caps in an 18" rim, changed to the Ford torsion keys, shocks, spacer, maybe a Hotchkiss sway bar, you could more closely approximate the look of the original truck with a good ride (possibly improved even) and not have to buy a ladder for the kids. That is exactly what I am thinking of doing to my current 2005 Tahoe when my current tires (already on the 18" Silverado rims) need to be replaced. Does anyone agree or disagree with this assessment? Thanks and good luck with your project!!