Duramax 6.6L turbo-diesel with the Technology, Z71 Off-road, Gooseneck/5th wheel, Dark Essentials, and power retractable assist-step packages. The Technology package adds a rear camera mirror, head-up display, and adaptive cruise control, while the Z71 package includes off-road suspension, hill descent control, and skid plates. The Dark Essentials package and all-weather floor liners were dealer installed.