Duramax 6.6L V8 Turbocharged and 4WD. Crew Cab! White Knight! There isn't a better truck than this gorgeous-looking 2011 GMC Sierra 2500HD. While big on getting a lot of work done it doesn't take long to get accustomed to the size of this 2500HD Denali. The overall driving experience is rather civilized especially highway driving which garners a strong feeling of confidence and stability. 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...'