And you’ll notice an AT4 by those beefier fender flares and bright red tow hooks up front. Under the skin, GMC provides AT4 ... wheel of a 3500-series Denali 4X4 dually. The gently sweeping ...

The one-ton 2011 GMC Sierra Denali 3500HD dually made its world debut today at the PickupTrucks.com Heavy Duty Shootout in Michigan. You'll have to wait until Aug. 16 to find out how the big ...