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All of the 2020 GMC HD trucks will also feature GMC's industry-unique 6-way multiple configuration tailgate, first introduced on the 2019 Sierra 1500.

PHOTO BY STEVE FECHT FOR GMC - All Sierra HD trucks will feature GM's 6.6-liter Duramax diesel engine and an Allison 10-speed automatic transmission. A gasoline engine will also be availableRear-wheel-drive is standard, and 4WD is optional on all GMC HD trucks. 
GMC has revealed its line of heavy duty pickups for 2020, featuring increased towing capacity, new body styling, and advanced trailering technology.

The new heavy duty truck chassis will be available in 2500 3/4-ton and 3500 1-ton dually models. All Sierra HD trucks will feature GM's 6.6-liter Duramax diesel engine and an Allison 10-speed automatic transmission. The engine will deliver 445 horsepower and 910 pound-feet of torque. A gasoline engine will also be available, but details were not announced. Rear-wheel-drive is standard, and 4WD is optional on all GMC HD trucks.

Among the available trim levels of the 2020 truck line is a new AT4 off-road package with a raised Rancho suspension and advanced four-wheel-drive system. GMC's top luxury Denali trim will also be available on the HD line of trucks. All of the 2020 GMC HD trucks will also feature GMC's industry-unique 6-way multiple configuration tailgate, first introduced on the 2019 Sierra 1500.

GMC vice president Duncan Aldred introduced the trucks with a dramatic demonstration of towing power as a 3500 Heavy Duty towed an 80-foot yacht dangling from a mobile dry dock lift. The combined weight of the boat and lift totaled more than 225,000 lbs., although the trucks will be rated only up to about 30,000 pounds. According to Aldred, towing is the most common reason why customers buy GMC HD trucks.

GMC also touted its ProGrade Trailering system, which features 15 different camera views visible from the dash while connecting to a trailer and towing. The trailering system optionally includes a remote camera that can be mounted on the rear of the trailer to provide a "transparent trailer" view that shows the blind spots and the space behind the trailer as a constructed image. The effect allows the driver to virtually "see through" the trailer.

Pricing and fuel economy information was not released. The 2020 GMC Sierra HD goes on sale later in 2019 in 2500HD single rear wheel and 3500HD dual rear wheel and single rear wheel configurations.

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