The new 2021 GMC Sierra 2500 4WD Crew Cab AT4 combines rugged styling, heavy-duty capability and off-road performance into one ultimate heavy-duty truck. A durable yet refined cabin offers an exclusive AT4 interior with standard front leather seating surfaces in Jet Black with Kalahari accents. To heighten your awareness of the surroundings, there are available technologies such as up to 15 camera views, high-intensity LED headlamps and LED fog lamps for confident visibility. The advance d 2-speed AutoTrac transfer case features an active automatic 4WD setting that provides seamless shifting 12 between two- and four-wheel drive based on road conditions. Exploring the interior of the Sierra HD AT 4 even further to find a durable yet refined cabin that offers premium materials and advanced technologies for comfort and control. The Jet Black interior with Kalahari accents, features a leather-wrapped heated steering wheel, 10-way power front seats with heated and ventilated leather seating surfaces, heated rear outboard seats and smart storage compartments. There’s also premium floor liners with removable carpet inserts.  To give you a clear view of vehicle information in your line of sight, the multicolor 15” diagonal Head-Up Display projects key information onto the windshield. Information includes an Off-Road Inclinometer that shows the fore-and-aft tilt, front tire angle and left-and-right tilt.

And when it’s time for the rugged, tough but fun stuff, it begins with the tailgate to end all tailgates.  The Sierra HD offers the World’s First Six-Function GMC Multi-Pro Tailgate  that helps improve accessing, loading and unloading the cargo bed. It’s standard on 2021 Sierra 1500 SLT, AT4 and Denali and most Sierra Heavy Duty models. And when you’re camping or tailgating and want to bring your music outdoors—without leaving your Sierra running. If needed, there’s the accessory MultiPro Audio System by KICKER® that’s designed to integrate into the MultiPro Tailgate. This 100-watt exterior audio system has full Bluetooth streaming capability. Automatic locking rear axle is part of the standard trailering package, with Hitch Guidance and Hitch View. The GMC ProGrade Trailering System and the Vision Camera are also standard. The Sierra HD offers beds that are long and wide to handle your biggest loads. The bed height makes for comfortable lift-in loading and is optimized for gooseneck/fifth-wheel trailer clearance. To help protect the floor, a spray-on bedliner is standard. Plus, side bed steps are standard too, for easy access, even with a gooseneck or fifth-wheel trailer hitch, and there’s a cornerstep rear bumper with large footwells. 

THE NUMBERS: MSRP/From $58,600 —  MPG/About 19.91 combined