I've been reading and searching for 3 weeks and I believe I have the the answer...but I want to confirm or at least get differing opinions.
A 3-3.5" leveling kit like the Zone, Cognito, or Superlift, that comes with new UCA are much less prone to breaking stuff and are a pretty good option if you just want to add slightly bigger tires like say a 295/60/20 or 35x11.50 but all require a different offset than the factory wheels...OR the best option would be to go with a full kit like the BDS, Zone, Procomp, etc some of which you can reuse the factory wheels which helps to offset the higher cost of the full lift, but require you to cut up your truck.
I miss the days of swapping out torsion bar keys and doing a little cranking, swapping out the factory block for a 4" and calling it a day. Drove my 2001 Sierra like that for nearly 300K HARD miles with no issue.