Base 4x4 Double Cab 6.75 ft. box 149.4 in. WB
2021 GMC Sierra 2500HD

The 2021 GMC Sierra Heavy Duty is the uptown cousin of the Chevrolet Silverado HD. It was updated last year, and for 2021 it gets two new models, one for off-road (X31) and another for luxury (Denali Black Diamond). It comes in 2500 and 3500 versions, with single- or dual-rear-wheel configurations, and a choice of two V-8 engines, standard or turbodiesel. Regular-, double-, or crew-cab configurations are available, the last of which is most popular.

Probably even more than other trucks in its class, the Sierra is all about size, at least from a visual standpoint, with its hugely wide …
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