2025 GMC Sierra 1500 AT4 Duramax :: Featured Classified

Full-size trucks have become the preferred choice for travelers looking to take a big trip or live on the road full-time. Unlike their midsize counterparts, they boast the structural strength, payload, and power to safely accommodate a fully equipped camper, supplies, and occupants. One of the most impressive all-rounders within the segment is the GMC Sierra 1500 AT4 Duramax, which delivers above and beyond what we expect from an overland platform. It’s one of an illustrious few that enjoys on-demand support from industry giant AEV (“American Expedition Vehicles”), which enables owners to transform this platform into a hardcore expedition vehicle with a catalog of rigorously tested parts and accessories that either meet or exceed OEM quality and safety standards. It was subsequently chosen as an Overland Journal project vehicle with Executive Publisher Scott Brady stating, “I have driven the AT4 29,000 miles, usually loaded with the camper, which I spent two months living out of. Most days, I was off-highway, exploring an area or finding a campsite. During that time, we did not have a single warranty claim and have experienced no failures in the truck or camper … it hauled motorcycles and was pushed within 700 pounds of GCVWR while hauling a sailboat from Texas back to Arizona. Incredibly, we traversed a section of Hell’s Revenge in Moab with the camper attached. It took me everywhere I wanted to go, sipped fuel, and rewarded me with a fireplace and stunning view at the end of a long, dusty day.” To this end, cue today’s one-owner, low-mileage 2025 GMC Sierra 1500 AT4 Duramax (15,700 miles), which boasts premium upgrades and is topped with an ARE Topper. In addition, it enjoys a bumper-to-bumper and powertrain warranty and is available today with no lead time. At $62,000, this almost new package represents impressive value and could be enjoyed as is or serve as a pinnacle foundation for a full expedition build-out (learn more on the GMC Sierra 1500 AT4 on the Expedition Portal YouTube channel).

From the Seller:

“This truck is fantastic! This is my 2025 GMC Sierra 1500 AT4, which is the perfect blend of luxury and off-road capability. It features the highly desirable (and powerful) 3.0-liter Duramax turbo-diesel engine paired with a 10-speed automatic transmission. With only 15,700 miles, this truck is barely broken in and remains under full factory warranty. The AT4 trim comes standard with a 2-inch factory lift and the MultiPro Tailgate. I’m averaging well over 20 mpg on windy, hilly roads out here in West Marin. Floating down the highway using cruise control, I’ve seen just shy of 30 mpg over a couple of hundred miles (which is pretty incredible considering its size). I’ve towed a 7,000-pound trailer with this truck six times on short trips. It can handle more, for sure, and this weight did not stress the truck. The condition is almost as new, and it has had no accidents. Non-smoker. Some rock chips on the front lower panel. I can email over additional photos/videos and the Carfax if requested.”

2025 GMC Sierra 1500 AT4 Duramax (Volcanic Red)

The Sierra is fitted with a 3.0-liter Duramax turbo-diesel motor that produces 305 horsepower and 495 pound-feet of torque and is matched to a 10-speed automatic transmission. A dependable and economical engine is matched with impressive capability thanks to 4WD, high and low range, armor, a lifted and uprated suspension, a rear locking differential, rated recovery points, and intelligent onboard assists such as a Traction Management System, Hill Descent Control, and StabiliTrack stability control. Inside, these rugged backcountry attributes are balanced with a luxurious interior with driver comforts that include:

Heated multi-function steering wheel
Infotainment system, 13.4-inch screen, with premium Bose sound system
Adaptive cruise control
HD Surround Vision, 360-degree cameras
Center console with cupholders
Dual-zone climate control
Keyless entry and pushbutton start
USB ports, 12-volt outlets, and wireless charging pad
Wi-Fi hotspot capability
Forward Collision Alert, Automatic Emergency Braking, and Lane Keep Assist
Rearview camera and parking sensors
MultiPro 6-function tailgate
Powered, heated, and ventilated black perforated leather seats with Kalahari accents, and heated rear seats

Distinguishing Features

Decked Drawer System
Rear air bags with compressor and Bluetooth remote control
ARE paint-matched topper with “windoors”
Spray-on bedliner (factory option)
All-weather AT4 floor liners

This 2025 GMC Sierra 1500 AT4 Duramax is listed for $62,000 and is currently located in Woodacre, California. Check the full vehicle specifications via the original Expedition Portal forum post here.