2005 GMC Yukon, 163k. Out, Dex Cruel, T flush with tap to start, then a 1 hour drive with NAPA Rad Cleaner. T flush again, drain, RO fill, drain. Replace thermostat, RO fill, drain, then Peak Global Lifetime concentrate, and RO top off. I was surprised but it was clean, and no residue or crud came out at any time.
PGL was super easy to get. Went to NAPA.com, had it sent to my local NAPA, picked it up at the store.