I've run GY GSA's (came with truck), General Ameritrac TR's, and now Firestone Transforce AT's. The Firestone have been the longest wearing of them all. Got 35K out of the GY but they all cracked on the sidewalls, the Generals I only got 25k out of before they wore out completely, and I have 40k with the Firestones and they should be good for another 20k.
I didn't buy Michelins because I wanted/needed a more agressive off road tire.
All tires were the stock 235/80R17 size.
Juan