Here is the advertisement for the 2021 GMC Sierra 2500HD AT4: This powerful 2021 GMC Sierra 2500HD AT4 is ready to take on any adventure. Equipped with the robust Duramax 6.6L V8 Turbodiesel engine and 10-speed automatic transmission, this 4WD truck delivers exceptional capability and performance. - AT4 Premium Plus Package - Backup camera - Blind Spot Monitoring - Bluetooth - Carfax 1 Owner - Leather Seats - Navigation System - Push-button start - Remote Start System - Sunroof The Sierra 2500HD AT4 is packed with premium features that elevate your driving experience. Enjoy the convenience of the power-retractable assist steps, the utility of the gooseneck/5th wheel prep package, and the confidence of the dual 220-amp alternators. Stay connected with the advanced infotainment system, wireless charging, and 4G LTE Wi-Fi hotspot. Safety technologies like Forward Collision Alert, Lane Departure Warning, and Rear Cross Traffic Alert provide added peace of mind. This well-equipped AT4 model is ready to tackle any terrain or towing task with its off-road-focused suspension, hill descent control, and integrated trailer brake controller. The rugged exterior styling with black accents and 20-inch machined aluminum wheels completes the bold, capable look. Service records are available, and this one-owner Sierra 2500HD has been meticulously maintained. Experience the uncompromising power, capability, and premium features of this exceptional truck. Come in today and let us show you why the 2021 GMC Sierra 2500HD AT4 is the perfect choice for your next adventure.