I purchased used with 40,000 miles for the 4x4. I live in a semi-rural area and the roads don't get treated. I have the 5.3 V8, and G80 locker. For the two months I've driven, it has worked like a charm. Been using the AutoTrac 4x4 which is the button system that goes into 4WD Auto, which is AWD. Had to dig the wheels out a little when I drove into 3' high snow in my driveway. I rocked the truck back and forth a couple of times and was out. I get around 20 mpg on country roads and highway. I don't drive heavy footed, usually 65-75 hwy. Only thing that I find annoying is the wipers can't be lifted off the windshield when it snows, because of the hood design. Takes longer to clean the window.
Doesn't matter now. Its an 04. The newer trucks look bloated. Go back to older body styles.