Discover the latest lineup of new GMC trucks and SUVs at Red Rock GMC. From the rugged Sierra to the versatile Acadia and luxurious Yukon, you'll find Professional Grade capability, advanced technology, and exceptional comfort in every model. Our team is here to help you find the right GMC with a straightforward, hassle-free buying experience.

- Duramax 6.6L V8 Turbodiesel engine with 470 hp and 975 lb-ft of torque
- Max Trailering Package with 3500 HD frame, 12" rear axle, and gooseneck/5th wheel prep
- AT4 Premium Plus Package including power sunroof and Technology Package
- Power-retractable black assist steps with LED lighting
- 10-way power driver and passenger seats with lumbar support and heating/ventilation
- Multicolor 15" diagonal head-up display
- Premium Bose 7-speaker sound system with SiriusXM 360L
- HD Surround Vision with bed view camera and trailer camera provisions
- Wireless charging and wireless phone projection
- Apple CarPlay and Android Auto integration
- Heated steering wheel and auto-dimming door mirrors
- All-weather floor liners for first and second rows with AT4 logo
- 220-amp alternator and engine block heater
- 20" high-gloss black aluminum wheels
- Off-road suspension with hill descent control and 2-speed active transfer case

This 2026 Sierra 2500HD AT4 arrives in white with just 5 miles on the odometer, representing a fresh opportunity to own a truck equipped for serious work and premium comfort. The AT4 trim combines rugged capability with refined appointments, featuring heated and ventilated front seats finished in perforated leather, along with heated rear outboard seats for passenger comfort in any season. The available Technology Package brings modern connectivity through the premium GMC infotainment system, with dual USB charge and data ports in the center console, plus rear charge-only USB ports to keep devices powered on the road.

Professional-grade capability defines this diesel-powered Sierra. The Duramax engine delivers commanding performance with an impressive 975 lb-ft of torque, paired with a 10-speed automatic transmission and 4WD to handle diverse driving conditions. The Max Trailering Package upgrades the frame to 3500 HD specifications with a 12" rear axle, beefed-up leaf springs, and premium shock absorption, complemented by gooseneck and 5th wheel prep provisions for serious hauling applications.

Practical features enhance everyday utility without compromise. The power sunroof brings natural light to the cabin, while the spray-on bed liner protects your truck bed and includes the GMC logo for a finished appearance. Power-retractable assist steps with integrated LED lighting make entry and exit easier, especially valuable when working around the truck. The bed-mounted 120-volt power outlet and instrument panel outlet provide convenient charging for tools and equipment.

Advanced safety and convenience technology comes standard on this AT4. Automatic emergency braking, forward pedestrian braking, and rear cross traffic alert work together to prevent collisions, while trailer side blind zone alert and lane departure warning keep you aware of hazards. The in-vehicle trailering system app, combined with hitch guidance and multiple camera views, transforms complex towing operations into manageable tasks with precision guidance.

The AT4 design emphasizes distinctive styling with the gloss black header grille, LED smoked amber roof marker lamps, and body-color bumpers. Winter-ready features include the engine block heater to support cold-weather starts, plus rain-sensing wipers and a power sliding rear window with defogger for year-round capability.

Select Shield includes a 3-month or 3,000-mile limited warranty on select vehicles, valid in all 50 states. New vehicles receive coverage beginning after the manufacturer's basic warranty ends.