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2021 GMC Sierra: New trailer tech, Denali Black Diamond trim on tap

GMC's Sierra has been killing it when it comes to trailering. These new updates and a flashy Denali HD Black Diamond Edition only make it better.

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Emme Hall

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The GMC Sierra, pictured here in new HD Denali Black Diamond Edition trim, gets a slew of new trailering tech for 2021. 

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Most importantly, there are new sensors that can warn of an impending jackknife situation.

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Jackknifing is a dangerous condition that occurs when a trailer swings into an L or V shape with respect to the truck towing it.

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A new Trailer Length Indicator works as an enhanced blind-spot monitoring system. When a driver activates a turn signal, a red overlay is displayed on the video feed on the infotainment screen, extending twice the length of the trailer to help them see what's in their blind spot.

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Enhanced Cargo Bed Zoom view and Bed Hitch Guidance for gooseneck trailers is also new for model year 2021.

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The 2021 GMC Sierra also features new reverse guidelines on the center infotainment screen.

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