Tried & True! This 2008 GMC HD 3500 Crew Cab Flatbed Dually just came in and its off to detail, it's a local trade with only 84,888 miles. This Duramax with the Allison Transmission is a work horse with all the features like power windows and locks, AM/FM/CD sound system, both gooseneck and bumper pulls Tow package, and much, much more!