Spotted: The GMC Sierra HD AT4X Looks Big and Mean

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It's easy to spot the GMC Sierra HD AT4X as it barrels down the highway.

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With its beefy body and black grille, this full-size pickup truck looks big and mean.

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Onlookers may not realize the truck packs plenty of features underneath that tough exterior.

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An impressive 12-inch touchscreen display puts a world of entertainment at drivers' fingertips, while air suspension keeps them comfortable on the ride.

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An upgraded trailering package with high-tech cameras gives the Sierra HD extra confidence for all sorts of adventures.

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But one look is enough to tell you this vehicle has serious capability and presence on the road.

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Ram 1500 TRX and a Ford F-150 Raptor R were spotted cruising together. - USA Vehicle

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