So I did the upgrade. Rotors, pads, calipers and brackets all from a 2007 Tahoe. Everything bolted on as this thread suggests.
The brakes feel amazing. The truck stops hard and I no longer have a terrible shake in the wheel when I have to get on them hard. I was also fighting a random ABS issue that seems to be fixed now. I attribute that to the disgusting fluid.
In the photos below, the purple calipers are OEM. My reason for replacing was that the bleeders were seized. You can tell by the brake fluid in the Dr. Pepper bottle that it was in desperate need of a flush.
Last photo is a before and after. I had to install new tie rod ends so I took the opportunity to take some load off the torsions and put it back to stock.
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