The 2014 GMC Sierra 3500 Denali is on the market. GMC Sierra is a heavy duty pick up truck. It is the same vehicle as the Chevrolet Silverado. They are in production since 1998. Sierra and Silverado were almost the same through most of their production, with one exeption, Silverado has been advertised as the pick up truck meant for agriculture and Sierra as the industry oriented pick up truck. Since 2001 GMC introduced more luxurious version of this pick up truck called Sierra C3, which later changed its name to Sierra Denali (in 2002).