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.

Aside from its 6.0-liter petrol-powered V8, the Sierra 2500HD crew cab 4WD will also be available with the all-new next-generation Duramax 6.6-liter V8 turbo-diesel, sending 445 HP (332 kW) and 910 lb-ft (1,234 Nm) to all four wheels.

"The new Sierra HD All Terrain X's powerful attitude reflects a popular trend in very capable off-road trucks, executed with a range-topping level of refinement — a combination of attributes GMC has cultivated for years," said Duncan Aldred, VP of GMC sales & marketing. "And with the new, available Duramax 6.6L, this truck more than matches its bold good looks with true professional-grade capability."

Visually, the All Terrain X stands out thanks to its 18" black-painted aluminum wheels, 275/65R18 Goodyear Duratrac MT-rated tires, unique body-color grille surround for the All Terrain insert, body-color door handles and body side moldings, Black power-adjustable heated and power-folding mirrors with integrated turn signals, LED rear guidance lamps and LED amber clearance lamps, black belt moldings, 4" black sport side steps, and a black sport bar mounted in the bed.

Sierra HD customers will be able to order the new version in either Black Onyx or Summer White, with optional equipment such as a spray-on bedliner, Front & Rear Park Assist, Z71 off-road suspension package, underbody shielding, heated steering wheel and all-weather floor liners also available.

In terms of on-board tech, the 2017 Sierra 2500HD All Terrain X also features GMC IntelliLink with an 8" color touchscreen, Teen Driver, remote-locking tailgate, remote starting system, Rear Vision Camera, adjustable pedals, leather-appointed seats, heated front seats and wireless charging.