Filed under: Truck , Work , GM , GMC , Misc. Auto Shows , Diesel 2011 GMC Sierra Denali HD – Click above for high-res image gallery For the first time in its history – and considering that the company has been around for over 100 years, that’s significant – GMC decided to make an official appearance at the National Truck Equipment Association show in St. Louis. And the Professional Grade brand brought along the heavies…

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NTEA 2010: 2011 GMC Sierra Denali HD puts the Heavy in Heavy Duty