2005 Avelanche used at 18K miles. 2x4 with G80 locker. Major problems: transmission went out after 95K, My Suburban had over 150K without a problem. Investigating some had earlier problem's and most went out around 100K, so don't feel to bad. It has been reliable with little maintenance. Interior seem to fall apart fairly easy, buttons on dash, Cover on window pillar fell off. Light 4x4 with G80 locker did very well.
I really love my Avalanche. I bought it new and has been a great vehicle. I've had zero engine issues. things I've done are had to replace speedometer that sprung one day when it was about 10 below 0 outside. Had to have a airbag sensor replaced and replaced one of the oxygen sensors - which I found out is recommended after about 5 years anyway. Also a transmission solenoid was replaced, that was only $120 w/labor. I run the E85 a lot in the summer and I tow a heavy camper with it. Its not the best towing vehicle for something heavy but it gets by. I run Amsoil and engine still runs like new with 65k.
I bought an 89 Daytona Shelby when I was still on active duty; my intention to keep her forever. 8 years later and 2 children who outgrew the tiny seats had me searching the dealerships. I bought an 08 Dodge Quad Cab Big Horn over the summer, and one trip later realized my critical mistake. Using the mini-rear seats of the Daytona as a reference for something larger was a poor choice. One month later I was already scanning the dealership lots. I saw an 05 Avalanche (never, NEVER a fan of Chevy!)with 49,000 original miles- 1 owner, and the truck was nearly mint. The salesman prompted me to keep it overnight...he knew the outcome. She sure sits pretty in the driveway :)
I got it new in 2005, changed all fluids after 5 years, had new brakes because of lack of use......its my 3rd vehicle but I love it.....45,000 miles on it....... won't hold a big load....but the ride is great........... towing is ok..........but its really just a great riding all around vehicle...............only real complaint is the the brakes a very soft pedal action......I asked the dealer and they said that was they way it is.........they work good but I think soft.......this is my 3 avalanche and hope to keep it forever.....i am 70 years old.....its just a great all around vehicle.....