Chevy diesels with the Allison tranny have one of the most reliable combo's in the diesel pickup world. However, the GM body, frames and interior are some of the poorest in the industry. I am around alot of "user" types working in harsh environments particularly in the pipeline construction industry. The biggest complaints from GM owners is the truck wears out much faster than the engine/drivetrain.
2008 F-250 4X4 Lariat V-10
2002 Airstream Classic 30' w/SO #2074
2007 Kubota 900 RTV
1996 Ford Bronco
2007 Lincoln LT