This 2021 GMC Sierra 1500 AT4 delivers the capability and refinement you expect from a premium truck, ready to handle your demands both on and off the road.- 3.0L Duramax I-6 Diesel Turbocharged Engine with 277 hp and 460 lb-ft of torque- 10-Speed Automatic Transmission with 4WD- Preferred Equipment Group 4SB- Trailering Package with Integrated Trailer Brake Controller and Hitch Guidance- 20 Machined Aluminum Wheels with Carbon Grey Metallic Accents- Goodyear Wrangler Territory LT265/60R20 Tires- Perforated Leather-Appointed Front Seat Trim with Heated and Ventilated Seating- 10-Way Power Driver and Passenger Seats with Lumbar Support- Heated Steering Wheel- GMC Infotainment System with Apple CarPlay and Android Auto- SiriusXM with 360L Satellite Radio- ProGrade Trailering System with In-Vehicle Trailering App- HD Rear Vision Camera with Hitch View- Off-Road Suspension with Hill Descent Control and Auto-Locking Rear Differential- Engine Block Heater and Heavy-Duty Air FilterThe AT4 trim represents GMC's commitment to serious capability. The 3.0L Duramax diesel provides efficient torque for towing and hauling, while the 4WD system and off-road suspension prepare you for challenging terrain. You'll appreciate the 22 city and 26 highway MPG efficiency that stretches your fuel budget further than comparable gas engines.Inside, the truck prioritizes your comfort with heated and ventilated leather front seats, dual-zone automatic climate control, and a heated steering wheel for those cold mornings. The 10-way power seats with lumbar support keep you positioned correctly during long drives. Premium floor liners protect the cabin, while the overhead console and strategically placed power outlets keep your devices charged and organized.Technology enhances both convenience and capability. The GMC Infotainment System integrates Apple CarPlay and Android Auto for seamless smartphone connectivity, while SiriusXM with 360L brings satellite radio and streaming to your drive. The ProGrade Trailering System, integrated trailer brake controller, and in-vehicle trailering app transform towing into a managed, confident operation. HD rear vision camera with hitch view guidance takes guesswork out of hitching and backing.Safety and security come standard with dual front impact airbags, front side impact airbags, overhead airbags, electronic stability control, and brake assist. Remote keyless entry with panic alarm, keyless open and start, and a theft deterrent system provide peace of mind whether you're at home or on the job site.The Cayenne Red Tintcoat exterior commands attention while 20 machined aluminum wheels with carbon grey metallic accents give the AT4 its distinctive personality. The spray-on pickup bed liner features the AT4 logo, rear wheelhouse liners protect against rust, and red recovery hooks stand ready when duty calls.This Sierra 1500 AT4 has been maintained and is prepared for its next owner. Whether you're towing, hauling, or exploring, this truck combines the efficiency of diesel power with the refinement GMC owners expect. We invite you to schedule a test drive and experience the AT4 difference firsthand.