Gmc 3500hd denali dually Read Also: Gmc 3500hd denali dually for sale 2012 Gmc denali 3500hd dually for sale Gmc sierra 3500hd dually 4wd 3500Hd gmc dually 2008 towing specifications Gmc 3500hd dually for sale 08 Gmc dually