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gmc sierra all terrain

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    Official: 2015 Sierra All Terrain HD looks ready to hit heavy-duty trails
    1400772660

    GMC is getting its heavy-duty trucks ready for the mud this summer with its All Terrain package for the Sierra 2500HD and 3500HD. Meant to blend style, tech and ruggedness, the pack includes a lot of extra chrome outside and an off-road package underneath. The 2015 Sierra All Terrain HD trucks ...

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