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2021 GMC Sierra adds towing tech, new HD Black Diamond Edition
Trailer towing is the focus of several new technologies coming to the 2021 GMC Sierra pickup, with the new features available both on the Sierra 1500 and the Sierra HD. The 2021 Sierra also sees expanded availability of GMC’s MultiPro tailgate, a price cut for the available 3.0-liter Duramax turbodiesel six, and a new Black Diamond Edition of the Sierra HD.
Source: https://www.autoblog.com/2020/09/15/2021-gmc-sierra-pickup-updates/
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