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2025 GMC Sierra 2500HD AT4 Crew Cab 4WD Duramax Onyx Black with Jet Black and Kalahari Accent InteriorMid-summer HD truck shoppers near Terrell, Rockwall, Forney, Kaufman County, Greenville, Canton, or East DFW looking for a premium diesel truck with off-road attitude should take a close look at this 2025 GMC Sierra 2500HD AT4 Crew Cab 4WD in Onyx Black. This CarBravo Certified Sierra is built for shoppers who want Duramax strength, four-wheel-drive confidence, AT4 style, premium comfort, low mileage, and serious trailering equipment in one heavy-duty truck.If you are comparing a GMC Sierra 2500HD AT4, Chevrolet Silverado 2500HD Z71, Silverado 2500HD ZR2, Ford F-250 Lariat Tremor, Ram 2500 Rebel, Ram 2500 Laramie, or another premium diesel three-quarter-ton truck, this Sierra makes its case with the 6.6L Duramax Turbo-Diesel V8, Allison 10-speed automatic transmission, one-owner Texas history, clean reported CARFAX history, and CarBravo Certified confidence from Platinum Chevrolet in Terrell.Power comes from the Duramax 6.6L Turbo-Diesel paired with the Allison 10-speed automatic transmission and four-wheel drive. This setup gives HD truck buyers the strength they expect for towing needs, work use, highway travel, ranch roads, jobsite demands, equipment trailers, RV trips, hunting lease prep, and regular truck life around East DFW and East Texas.The AT4 trim gives this Sierra a stronger personality than a standard HD truck. Highlights include all-terrain tires, skid plates, red front recovery hooks, Traction Select with off-road and tow/haul modes, auto-locking rear differential, 2-speed Autotrac transfer case, spray-on bedliner, GMC MultiPro Tailgate, LED cargo area lighting, animated LED projector headlamps, LED fog lamps, roof marker lamps, and the bold Onyx Black AT4 look truck shoppers search for on purpose.This Sierra also brings high-content trailering and technology with the AT4 Premium Plus Package, Technology Package, Gooseneck/5th Wheel Package, trailer brake controller, ride trailering app, Trailer Side Blind Zone Alert, 7-pin trailer harness, HD Surround Vision, Rear Camera Mirror, multicolor Head-Up Display, Front and Rear Park Assist, Rear Cross Traffic Alert, Safety Alert Seat, and power-retractable assist steps.Inside, this AT4 adds the comfort buyers want in a premium HD truck. Features include heated and ventilated front bucket seats, heated rear outboard seats, heated steering wheel, driver seat and mirror memory, dual-zone automatic climate control, premium floor liners, 13.4-inch GMC Premium Infotainment screen with Google built-in compatibility, 12.3-inch digital Driver Info Center, wireless Apple CarPlay, wireless Android Auto, Bose premium sound, remote start, power sliding rear window, and power sunroof.CARFAX reports no accidents or damage reported, regular oil changes, 4 service history records, one-owner history, personal-use history, Texas ownership, and about 13,026 miles. This Sierra is not being positioned as a basic work truck or simply the cheapest HD diesel online. The strength is the full picture: Duramax diesel power, Allison transmission, AT4 Premium Plus content, 4WD capability, low listed mileage, clean reported CARFAX history, premium comfort, 5th-wheel/gooseneck equipment, one-owner Texas background, and CarBravo Certified confidence.At Platinum Chevrolet in Terrell, we make HD truck shopping easier to compare with transparent pricing, no required dealer-installed add-ons unless you choose them, no forced extras, and clear info before you make the drive. Message Platinum Chevrolet today to confirm stock on this CarBravo Certified 2025 GMC Sierra 2500HD AT4 Crew Cab 4WD Duramax.