This 2025 GMC Sierra 3500HD Denali Ultimate delivers exceptional capability wrapped in premium refinement, designed for those who demand the best in heavy-duty performance and comfort.- Duramax 6.6L V8 Turbodiesel with 10-Speed Automatic and 4WD- Bose Premium Series 12-Speaker System with SiriusXM 360L- Multicolor 15" Diagonal Head-Up Display- HD Surround Vision with Bed View Camera and Trailer Camera Provisions- ProGrade Trailering System with Hitch Guidance and In-Vehicle Trailering App- Gooseneck/5th Wheel Prep Package- X31 Off-Road Package with 2-Speed Active Transfer Case and Hill Descent Control- 16-Way Power Driver and Passenger Seat Adjusters with Lumbar Support- Full Grain Leather Seat Trim with Heated and Ventilated Front Seats- Power Moonroof with Deep-Tinted Glass- Signature Denali Ultimate Grille in Vader Chrome with LED Smoked Amber Roof Markers- Wireless Charging and Wireless Phone Projection- Automatic Emergency Braking with Front Pedestrian Braking- Ultrasonic Front & Rear Park Assist with Rear Cross Traffic Alert- 20" Ultra-Bright Machined Aluminum WheelsThe commanding black exterior makes a statement on any road, enhanced by the Signature Denali Ultimate Grille in Vader Chrome and LED smoked amber roof marker lamps. The Spray-On Pickup Bedliner with GMC logo protects your investment while maintaining the truck's sophisticated appearance. Rain-sensing wipers and fully automatic headlights with IntelliBeam technology ensure visibility in all conditions, while the power sliding rear window adds convenient access to your cargo area.Inside, the Denali Ultimate surrounds you with genuine wood dashboard and door panel inserts paired with full grain leather seat trim. The 16-way power driver and passenger seat adjusters with lumbar support offer personalized comfort for long drives, while heated and ventilated front seats adapt to any season. The heated steering wheel adds another layer of refinement during cold mornings.This truck is engineered for work and play. The Duramax 6.6L V8 Turbodiesel paired with the 10-Speed Automatic transmission provides the power you need, while the 4WD system with Off-Road Suspension and the X31 Off-Road Package tackle challenging terrain. The 2-Speed Active Transfer Case and Hill Descent Control give you confidence in any driving situation.Technology keeps you connected and in control. The GMC Premium 13.4" Diagonal Information Display and Multicolor 15" Head-Up Display put critical information within your line of sight. The ProGrade Trailering System integrates seamlessly with the Hitch Guidance and In-Vehicle Trailering App, making towing intuitive and safe. HD Surround Vision and the Bed View Camera with trailer camera provisions give you complete visibility of your surroundings and what you're towing.Safety features are comprehensive throughout. Automatic Emergency Braking with Front Pedestrian Braking helps prevent collisions, while the Rear Cross Traffic Alert and Trailer Side Blind Zone Alert protect you in vulnerable situations. Ultrasonic Front & Rear Park Assist and the rearview camera make parking this full-size truck manageable in tight spaces. The Safety Alert Seat provides tactile warnings when hazards are detected.This Sierra 3500HD Denali Ultimate represents the pinnacle of heavy-duty truck capability, combining work-ready performance with premium comfort and advanced technology. We invite you to experience this truck firsthand and discover why it stands apart in its class.