Downpour Metallic 2025 GMC Sierra 3500HD Denali Ultimate Denali Ultimate Duramax 6.6L V8 Turbodiesel Gooseneck/5th Wheel Prep Package, Preferred Equipment Group 5SB (120-Volt Bed Mounted Power Outlet, 120-Volt Instrument Panel Power Outlet, 2 Charge-Only Rear USB Ports, 2 Charge/Data USB Ports Inside Center Console, 2 USB Ports, 2-Speed Active Transfer Case, Bed View Camera w/2 Trailer Camera Provisions, Bose Premium Series 12-Speaker System, Deep-Tinted Glass, Electric Rear-Window Defogger, Floor-Mounted Center Console, Front Rain-Sensing Wipers, HD Surround Vision, Heated 2nd Row Outboard Seats, Heated Driver & Front Outboard Passenger Seats, Hitch Guidance w/Hitch View, In-Vehicle Trailering App, Keyless Open & Start, LED Cargo Area Lighting, LED Smoked Amber Roof Marker Lamps, Manual Tilt-Wheel/Telescoping Steering Column, Power Front Windows w/Passenger Express Up/Down, Power Sliding Rear Window w/Defogger, Power Sunroof, ProGrade Trailering System, Push Button Start, Rear Cross Traffic Alert, Rear Wheelhouse Liners, Remote Vehicle Starter System, Safety Alert Seat, Signature Denali Ultimate Grille in Vader Chrome, SiriusXM w/360L Trial Subscription, Spray-On Pickup Bedliner w/GMC Logo, Steering Wheel Audio Controls, Trailer Camera Provisions, Trailer Side Blind Zone Alert, Trailer Tire Pressure Monitor Sensors, Ultrasonic Front & Rear Park Assist, Unauthorized Entry Theft-Deterrent System, Universal Home Remote, Ventilated Driver & Front Passenger Seats, Wireless Charging, and Wireless Phone Projection), Technology Package (Auto-Dimming Inside Rearview Mirror w/Camera and Multicolor 15'' Diagonal Head-Up Display), X31 Off-Road Package (Hill Descent Control), 10-Speed Automatic, 4WD, Alpine Umber Leather, 12 Speakers, 16-Way Power Driver Seat Adjuster w/Lumbar, 16-Way Power Passenger Seat Adjuster w/Lumbar, 220 Amp Alternator, 3.42 Rear Axle Ratio, 4-Wheel Disc Brakes, ABS brakes, Air Conditioning, Alloy wheels, AM/FM radio: SiriusXM with 360L, Auto High-beam H