Recent Arrival! We are offering this 2019 GMC Sierra 2500HD, in Onyx Black and Jet Black Leather. CARFAX One-Owner. Duramax 6.6L V8 Turbodiesel Allison 1000 6-Speed Automatic 4WD Odometer is 2661 miles below market average! Serving the greater Northern Colorado and Denver area, including Fort Collins, Greeley, Loveland, Highlands Ranch, Broomfield, Longmont, Boulder, Parker, and Thornton.