2021 GMC Sierra 3500HD

The 2021 GMC Sierra 1500 and Heavy Duty models offer several new available features that build on the trucks' strong suite of customer-focused trailering technologies.

These updates arrive as an ever-growing number of owners are turning to outdoor activities that require a trailer. New or enhanced trailering tech available on both 2021 GMC Sierra light-duty and heavy-duty models includes:

-- Trailer Length Indicator: When enabled and driving forward with the turn signal activated, the center console screen displays a red overlay twice the length of the compatible trailer and shows when other vehicles are present and may interfere with a lane-change maneuver.

-- Jack-Knife Alert: If the front of the trailer approaches the rear of the vehicle, an alert is displayed when there may be a potential jack-knife situation.

-- Rear Trailer View now features guidelines and Trailer-Angle Indicator: Rear Trailer View has been enhanced to include guidelines that assist when backing a trailer into place and a Trailer-Angle Indicator to show the relationship between the truck and compatible trailer.

The available 3.0L Duramax Turbo-Diesel, which provides an ideal balance of performance and efficiency with 460 lb-ft of torque and best-in-class horsepower while offering up to an EPA-estimated 30 mpg on the highway and 660 miles of range on 2WD models, is a popular choice for GMC Sierra customers.

The 2021 Sierra 1500 also features increased conventional trailering capability for two of its most efficient engines. Compared to the 2020 model year: 3.0L Duramax Turbo-Diesel adds up to an additional 1,900 pounds of trailering capacity on 2WD configurations with a maximum trailering capacity of 9,300 pounds. The 2.7L Turbo adds an additional 2,300 pounds of trailering capacity to nearly every configuration with a maximum trailering capacity of 9,200 pounds.