The 2019 GMC Sierra is a tailored suit over a denim shirt. Based on the Chevrolet Silverado HD, the Sierra HD similarly comes in 2500 and heavier-duty 3500 flavors but with more emphasis on style and features. Top-tier Denali models are as close as you can get to a Cadillac pickup, and with a powerful gas or diesel V-8, there’s not much the...

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