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2025 GMC SIERRA 3500HD DENALI ULTIMATE 4WD 6.6L DURAMAX DIESEL 5TH WHEEL PREP MASSAGE SEATS SUNROOF ONYX BLACK LANCASTER PA
This 2025 GMC Sierra 3500HD Denali Ultimate 4WD is powered by the 6.6L Duramax turbo-diesel V8 paired with a 10-speed Allison automatic transmission. Finished in Onyx Black with an exclusive Alpine Umber full-grain leather interior, this top-of-the-line heavy-duty pickup features the Gooseneck/5th Wheel Prep Package, massaging front seats, power sunroof, Technology Package, and exceptionally low mileage.
The 6.6L Duramax produces an impressive 470 horsepower and 975 lb-ft of torque, delivering tremendous pulling power for large fifth-wheel campers, equipment trailers, and demanding workloads. The Sierra 3500HD offers serious heavy-duty capability while maintaining the premium comfort and refinement expected from a Denali Ultimate.
Inside, the exclusive Alpine Umber full-grain leather interior sets this truck apart. Heated and ventilated front seats with massage functionality, heated rear outboard seats, premium interior finishes, and a Bose Premium Series 12-speaker sound system create an outstanding luxury experience. The power sunroof and power-sliding rear window add even more comfort.
The Technology Package includes a 15-inch multicolor Head-Up Display, HD Surround Vision, Rear Camera Mirror, and Bed View Camera. Wireless charging and wireless smartphone connectivity add convenience, while the advanced camera systems provide valuable visibility when maneuvering this full-size heavy-duty truck.
Towing equipment is a major highlight. The factory Gooseneck/5th Wheel Prep Package makes this Sierra ready for compatible hitch equipment, while the ProGrade Trailering System includes Hitch Guidance with Hitch View, an in-vehicle trailering app, trailer camera provisions, Trailer Side Blind Zone Alert, and trailer tire pressure monitoring sensors.
The X31 Off-Road Package, two-speed transfer case, and Hill Descent Control provide additional capability for gravel roads, campsites, and challenging terrain. Whether you're towing a large camper or using this truck for demanding work, the Sierra 3500HD is built for serious applications.
Onyx Black gives this Denali Ultimate a bold, upscale appearance, complemented by its signature Vader Chrome grille and smoked amber roof marker lamps. A factory spray-on bedliner with GMC logo, LED cargo lighting, rear wheelhouse liners, and 120-volt bed outlet add practical functionality.
Additional features include remote start, rain-sensing wipers, Rear Cross Traffic Alert, front and rear parking sensors, and a Safety Alert Seat.
Mileage is another major advantage, with the odometer reading an impressive 16,516 miles below the market average.
With its powerful 6.6L Duramax, exclusive Alpine Umber leather interior, massaging seats, sunroof, fifth-wheel prep, advanced trailering technology, and exceptionally low mileage, this 2025 GMC Sierra 3500HD Denali Ultimate delivers an outstanding combination of luxury and heavy-duty capability.
See it today at Mark Martin Motors in Ephrata, serving Lancaster, Lititz, Lebanon, and York. Call or message us to check availability or schedule your test drive.