AdChoices
2026 GMC SIERRA 3500HD DENALI ULTIMATE 4WD DURAMAX DIESEL ULTIMATE PACKAGE SUNROOF X31 OFF-ROAD DOWNPOUR METALLIC LANCASTER PA
This isn't just a heavy-duty truck.
This is GMC's flagship.
A 2026 GMC Sierra 3500HD Denali Ultimate 4WD powered by the legendary 6.6L Duramax Turbo Diesel combines luxury, technology, and incredible towing capability into one of the most desirable heavy-duty trucks on the market.
Finished in stunning Downpour Metallic, this Denali Ultimate stands apart with its exclusive Vader Chrome grille, premium exterior styling, LED lighting, and unmistakable road presence. It looks every bit as premium as it performs.
Under the hood is the legendary 6.6L Duramax Turbo Diesel paired with the renowned Allison 10-speed automatic transmission. This proven combination delivers incredible torque, effortless towing power, and the long-term durability diesel buyers expect.
Whether you're pulling a fifth wheel, horse trailer, toy hauler, or equipment trailer, this truck was built for serious work.
And it's already equipped with the highly desirable Gooseneck/5th Wheel Prep Package, along with GMC's ProGrade Trailering System, making towing easier and more confidence inspiring than ever.
Step inside and you'll immediately understand why the Denali Ultimate sits at the top of the GMC lineup.
Premium Full-Grain Alpine Umber Leather.
Heated and ventilated front seats.
Heated rear seats.
Power sunroof.
Bose Premium 12-speaker sound system.
15-inch Head-Up Display.
Wireless charging.
Premium materials throughout the cabin.
This interior rivals luxury SUVs costing well into six figures.
Technology is everywhere.
HD Surround Vision.
Rear Camera Mirror.
Trailer Camera Provisions.
Trailer Side Blind Zone Alert.
Trailer Tire Pressure Monitoring.
Hitch View.
Safety Alert Seat.
Rear Cross Traffic Alert.
The available Technology Package makes towing, parking, and everyday driving remarkably easy.
And because this truck is equipped with the X31 Off-Road Package, you'll also enjoy upgraded off-road suspension, Hill Descent Control, skid plate protection, and added confidence when the pavement ends.
This Sierra is practically like new, with just over 2,000 miles below market average, offering the opportunity to own GMC's flagship heavy-duty truck without paying full new-truck pricing.
If you're searching for a 2026 GMC Sierra 3500HD Denali Ultimate Duramax for sale in Pennsylvania, a luxury diesel truck near Lancaster, Ephrata, Lititz, Harrisburg, York, Reading, Lebanon, Allentown, Philadelphia, Baltimore, Maryland, New Jersey, or Delaware, this truck deserves a serious look.
Finding a 2026 Sierra 3500HD Denali Ultimate equipped with the Duramax Diesel, Allison 10-Speed, Gooseneck Prep Package, Technology Package, X31 Off-Road Package, Power Sunroof, and Full-Grain Alpine Umber Leather is exactly the type of truck buyers wait months to find.
Available now at Mark Martin Motors in Ephrata, PA, proudly serving Lancaster County and customers nationwide.
Call or message Mark Martin Motors today before this incredible Sierra 3500HD Denali Ultimate is gone.