Heavy-duty capability meets off-road confidence in this 2024 GMC Sierra 2500HD AT4 in Onyx Black. Built for serious towing and demanding terrain, the AT4 trim delivers rugged styling with a premium edge, giving this truck a commanding presence whether its on the job site or out on open roads. Its bold stance and purpose-built design make it clear this is no ordinary heavy-duty pickup. Under the hood, the Duramax 6.6L Turbo-Diesel engine provides exceptional torque and long-haul strength, making it ideal for towing large trailers, equipment, or recreational loads with confidence. The Gooseneck/5th Wheel Package adds serious capability for heavy towing setups, reinforcing its role as a dependable workhorse built for real-world demands. Advanced technology enhances both safety and convenience. Power retractable assist steps make entry and exit easier without compromising ground clearance, while the rear camera mirror provides a clear, unobstructed view behind the truck. HD Surround Vision adds a comprehensive birds-eye perspective, making tight maneuvers and trailer positioning more manageable and precise. Proudly serving McKinney, Allen, Plano, Frisco, The Colony and all of DFW and North Texas.