GMC Launches 2017 Sierra HD All Terrain X Paired With All-New Duramax Diesel

GMC Launches 2017 Sierra HD All Terrain X Paired With All-New Duramax Diesel

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Joining the likes of the Canyon and Sierra 1500 this fall as the third model in GMC's limited-edition All Terrain X series, the Sierra HD All Terrain X is said to be the most off-road-capable truck in the Sierra HD lineup.
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