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2021 GMC Sierra 2500HD Denali Ultimate Duramax - Test Drive POV
In this video we take the a brand new 2021 Sierra 2500HD Denali Ultimate Duramax also equipped with the Black Diamond Edition package. For 2021, the heavy-duty Sierra receives a host of new or improved trailer-assistance features. There's a new jack-knife alert that does what its name suggests and a trailer-length indicator that lets the driver ...
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