This 2021 GMC Sierra 1500 AT4 in gray represents a capable truck built for both serious work and refined daily driving, combining premium features with genuine off-road capability.

- Power sunroof
- MultiPro Audio System by Kicker
- CarbonPro composite bed
- AT4 Premium Package
- LED cargo area lighting
- Heated and ventilated front seats
- Apple CarPlay and Android Auto integration
- Rear cross traffic alert with ultrasonic park assist
- Hill descent control
- Integrated trailer brake controller
- Remote vehicle starter system
- Heated steering wheel
- Wireless charging pad
- 4G LTE Wi-Fi hotspot capable
- ProGrade trailering system

The Sierra 1500 AT4 is powered by a 3.0L turbocharged diesel I-6 engine that delivers 277 horsepower and 460 lb-ft of torque, mated to a 10-speed automatic transmission with 4WD. This configuration achieves 22 mpg in the city and 26 mpg on the highway, balancing performance with efficiency. The truck sits on 20-inch carbon gray painted aluminum wheels wrapped in Goodyear Wrangler Territory tires, providing both on-road comfort and off-road traction.

The AT4 CarbonPro Edition elevates this truck with genuine premium appointments. The carbon fiber composite bed resists dents and dings better than traditional steel, while the unique grille surround features a black chrome finish. Black dual exhaust tips and the distinctive AT4 carbon hard badge emphasize its commanding presence. An AT4 high clearance step ensures easy entry and exit.

Inside, the cabin reflects GMC's commitment to quality. Perforated leather-appointed front seats offer heating and ventilation, adjustable via 10-way power controls with lumbar support. The power sunroof floods the cabin with natural light, while heated rear outboard seats extend comfort to passengers. The premium GMC infotainment system includes navigation, Apple CarPlay, Android Auto, and SiriusXM with 360L, all managed through a multi-touch interface. A Kicker audio system delivers exceptional sound quality.

Safety and convenience technologies are comprehensive. Ultrasonic front and rear park assist, rear cross traffic alert, and lane change alert with side blind zone alert provide confidence in challenging situations. The HD rear vision camera, hitch guidance with hitch view, and integrated trailer brake controller make towing safer and more intuitive. Hill descent control, electronic stability control, and traction control work together on any terrain. Additional features include keyless open and start, remote keyless entry, remote vehicle starter, and a comprehensive security system.

The AT4 Premium Package adds genuine capability with LT275/65R18C MT Goodyear Wrangler DuraTrac tires and trailer tire pressure monitor sensors. The off-road suspension and auto-locking rear differential are ready for gravel and light trails. An engine block heater prepares the truck for cold weather starts, while the heavy-duty air filter handles demanding conditions. Front premium floor liners and rear premium floor liners with removable carpet inserts protect the interior from mud and debris.

This Sierra 1500 AT4 comes ready for work, adventure, and daily responsibility. The combination of diesel efficiency, premium comfort, advanced safety features, and genuine off-road engineering makes this truck a solid choice for buyers seeking versatility without compromise.