Small upgrade
I have a 99 silverado Z71 and upgraded to a 285 series tire (equivalent of a 33"). They are BF Goodrich All Terrain TA's. I have put about 90,000 miles on them and expect them to last until the end of this summer. They are a little loud, but that's just an excuse to keep my music loud. The ride is good, and the speedometer seems to be just as accurate as with the stock tires. Any thing bigger than 285's will need some sort of suspension adjustment.