07 K2500 suburban
Cranked on stock keys most of the way, to clear the 32" 285/55R20 terragrapplers on 20x8.5 weld cheyenne 8's (still rubs slightly without trimmed liners)
It rode like crap so I picked up offset cognito tubular arms, and shock extensions (have stock length bilsteins on it) and the rear I replaced the stock shackles with sulastic shackles (takes some of the rough 3/4 ton unloaded harsh ride out of it)
I'd also recommend whatever you do get the cognito pitman/idler arm braces or something equivalent, really tightened up the steering. I also did my front end (balljoints/tierod ends/idler and pitman arms) around 95k with the moog problem solver stuff which tightened things up nicely.
Of course good luck finding much info on K2500 suburbans. The only saving grace is everything that works on our trucks is the same as the previous body style frame/suspension wise. gmt800-900 wise they're the same on 2500's. (I know the later pickups changed front ends and bolt patterns around 10/11 not positive on the suburbans)
