Look! Heavy-Duty Handling/Trailering Suspension Package, Vortec 6.0L V8 SFI VVT engine, 6-Speed Automatic transmission with Overdrive, 4WD, 4-Wheel Disc Brakes, AM/FM radio: XM, Power door mirrors, Power windows, and Remote Keyless Entry. If you travel a lot, you're going to LOVE this superb 2011 GMC Sierra 3500HD with low, low mileage. New Car Test Drive said, ...If you want the capability of a big pickup with the least sensation of driving a big pickup, the Sierra HD deserves consideration. In a world run amuck for ever-larger trailers and powerplants, it's a sensible alternative for anyone who needs to haul heavy material but doesn't want a Class IV or V truck to do it... This GMC Sierra 3500HD has a great cockpit layout, with all the controls easy to find and right where you need them.