"Elevate your next adventure with the remarkable 2026 GMC Sierra 2500HD AT4X. Engineered to conquer any terrain, this powerhouse combines uncompromising capability with refined sophistication. - Engine Block Heater - 220-Amp Alternator - Duramax 6.6L V8 Turbodiesel Engine - Gooseneck/5th Wheel Prep Package - AT4X AEV Edition with Premium Off-Road Features Indulge in the ultimate driving experience with premium amenities that elevate every mile: - Bose Premium 12-Speaker Audio System - Heated and Ventilated Leather Seats - Multicolor Head-Up Display - Wireless Charging and Phone Projection Prepare for any adventure with the Sierra's exceptional 4WD system, Off-Road Suspension, and advanced towing technologies. This one-of-a-kind AT4X model is the ultimate expression of GMC's unparalleled craftsmanship. ""Why buy from Greg Lair GMC"" It's a great question with an even better answer! We've been a local fixture in the Panhandle for nearly 40 years, putting customers from Amarillo and the Panhandle first every single day. We set ourselves apart as the home of the FREE Lifetime Powertrain Warranty on all inventory under 100,000 miles. From our hassle-free buying process to our thorough multi-point inspections by Certified GM Technicians, we make sure your next vehicle is safe, reliable, and ready for the road. Stop by today and see the Greg Lair difference for yourself!"