Discover the ultimate heavy-duty pickup with the 2025 GMC Sierra 2500HD AT4. Engineered to conquer any terrain, this rugged and capable truck is the perfect companion for your toughest jobs and wildest adventures.- Duramax 6.6L V8 Turbodiesel engine with 10-speed automatic transmission delivering exceptional power and efficiency- Gooseneck/5th Wheel Prep Package for seamless trailer towing- Two sets of keys for added convenience- Engine block heater for cold weather performanceTWO SETS OF KEYS- Durable, high-performance features including:- 220-amp alternator- Heavy-duty 80-amp battery- Exhaust brake- Off-road suspensionENGINE BLOCK HEATERALTERNATOR, 220 AMP6.6L V8 Diesel Turbocharged(Duramax) (B20-Diesel Compatible) (Includes (K05) Engine Block Heater) (470 hp [350.5 kW] @ 2800 rpm, 975 lb-ft of torque [1322 Nm] @ 1600 rpm)LAMPS, SMOKED AMBER ROOF MARKER, (LED)GOOSENECK / 5TH WHEEL PREP PACKAGE -- HITCH PLATFORM TO ACCEPT GOOSENECK OR 5TH WHEEL HITCH.Includes hitch platform with tray to accept ball, stamped bed holes with removable caps installed and bed mounted 7-pin trailer harness (similar to UY2 harness).Gooseneck/5th Wheel Prep PackageElevate your driving experience with premium comfort and convenience features, including:- Bose premium 7-speaker sound system- Heated and ventilated front seats- Heated rear outboard seats- Wireless charging- Surround vision camera systemDiscover the ultimate in heavy-duty capability, rugged style, and premium comfort with the 2025 GMC Sierra 2500HD AT4. Schedule a test drive today and experience the power and versatility that will elevate your driving experience.