Since 1998 the Sierra has been GMC's bread and butter pickup. Is the Sierra the best full size truck on the market" Learn more about the 2021 GMC Sierra 1500 4WD Crew Cab AT4 right here. ?? https://bit.ly/3vhUvBd
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00:00 2021 GMC Sierra 1500 4WD Crew Cab AT4 Intro
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