Purchased the truck with 24000 miles when it came off lease in 2003. It has 105,000 miles on it now, and the only thing I have done to it is add a battery and a U-joint. I have used synthetic oil and changed it religiously every 5000 miles, if you do this, it will run forever, so it seems. Suggestion: always set the parking brake before placing it in park.. if you do this then the transmission won't have to hold the weight of the vehicle. Great ride, would drive it anywhere. Comfortable on long trips from GA to CO. 4wd has been valuable. Gas mileage is pretty bad, but you get what you pay for. 16 MPG. Ive been to 19 but also 14 too..(running 285 tires).
The Tahoe is one of only a few SUVs that are actually designed with towing, real offroading, and truck sensibility in mind.
The Z71 has all the goodies that somebody who really needs an SUV for their outdoor adventures wants and needs (locking 4x4, a locking diff, big tires, truck frame, tons of clearance), without going overboard on gimick stuff. It has an engine with plenty of grunt to move boats, etc and a drivetrain which lets it go where 95% of other SUVs can only dream of going.