Most GMC buyers prefer their heavy-duty trucks gussied up and loaded to the gunwales with luxury and technology. While the choice between the Sierra HD and its mechanical near twin, the equally fresh 2020 Chevrolet Silverado HD 2500 and 3500, largely remains a matter of brand preference, newly available features exclusive to the GMC are finally starting to give it the feel of a premium big rig.
Difference in the Details
Make no mistake: Our initial drive in the new Sierra HD in Wyoming made for pretty much the same experience we had with the updated Silverado HD in Oregon. Both trucks are significantly bigger and bolder than before, with sturdier frames, massively increased towing and hauling capabilities, and smarter features all around. Except for its roof, none of the heavy-duty Sierra's chunky body panels are shared with its light-duty brethren, and the end result, at least to our eyes, is an imposing yet distinctly more refined and cohesive appearance than its Chevrolet counterpart's.
GMC says that feedback from HD customers wanting a more rugged look without the Denali's acres of chrome was a big reason for introducing the new AT4 model, which sits just below the Denali in the lineup and features monochromatic styling with darkened exterior trim and prominent red front tow hooks. Although the Sierra HD AT4 doesn't sport the two-inch suspension lift and knobby off-road tires as does the light-duty Sierra 1500 AT4, it does come standard with 18-inch wheels and all-terrain tires (20s are available), skid plates, and an off-road suspension with upgraded Rancho dampers that are optional on other Sierra HDs. Also included on the AT4 is hill descent control, a traction-management system with Off-Road mode, a configurable 15-inch head-up display, and a low-speed surround-view camera system.
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