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The 2020 GMC Sierra Heavy Duty AT4

Whether Headed to the Lake or the Job Site, the Sierra AT4 has you Covered

When you're a car and truck connoisseur, like the staff at Reed Buick GMC, it takes a lot to excite you. Seeing a truck like the 2020 GMC Sierra Heavy Duty AT4 roll on the lot is one of those things. As a continuation of the towing capability of the 2019 GMC Sierra light duty, this workhorse makes heavy lifting look good with Smart technology. 

The 2020 Sierra HD AT4 is more than just a heavy hauler. With the AT4 model, no terrain is impassable. The off-road suspension is complemented by Rancho Shocks, skid plates and an Eaton locking rear differential. Eighteen-inch wheels are wrapped with Michelin all-terrain tires and the Traction Select System has a specific Off-Road mode. Hill Descent Control and Hill Start Assist will keep you safe and get you going. 

For more information, head to Reed Buick GMC to see the 2020 Sierra up close and personal.


2020 GMC Sierra Heavy Duty AT4


AT4-specific darkened trim and Jet Black interior with Kalahari color accents, all in comfortable leather.


Proven Duramax 6.6L turbo-diesel engine mated with an all-new, segment-first Allison 10-speed automatic transmission. 


ProGrade Trailering System including 15 unique camera views and an industry-first transparent trailer view. 

Off Road

Traction Select System with Off-Road mode as well as HD Surround Vision 1 for low-speed views of vehicle surroundings.