2021 GMC Sierra 3500HD Review: The Big Kahuna

In the vanguard of heavy-duty pickup truck titans, the 2021 GMC Sierra 3500HD may not be the paragon amongst its vehement rivals but with its authoritarian presence, potent powertrains, and near-unassailable dependability, it's the big kahuna of GMC's Sierra line and a very worthy vehicle in the classification.
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