2018 GMC Sierra 2500HD Denali 4WD — 139,115 miles. Black exterior with Cocoa/Dark Sand leather interior. Exceptionally well-equipped heavy-duty truck built for towing, comfort, and capability. Performance & Towing - Duramax 6.6L Turbo-Diesel V8 (B20-compatible) paired with Allison 1000 6-speed automatic transmission for reliable low-end torque and highway power. - Trailering wiring provisions for conventional towing plus fifth-wheel and gooseneck setups, exhaust brake, switch-controlled high idle, and durable chrome recovery hooks. - Z71 Off-Road Package, hill descent control, fixed running boards, and rugged LPO accessories for serious work and off-road confidence. Comfort & Technology - Denali luxury trim with Cocoa/Dark Sand leather seating, heated and cooled front seats, power driver and passenger seats, and automatic climate control. - 8" diagonal GMC infotainment touchscreen with navigation, AM/FM/SiriusXM, HD Radio and Bose premium audio. - Power sunroof, Universal Garage Door Opener, remote engine starter, and all-weather LPO floor liners. Safety & Driver Assistance - Driver Alert Package including lane departure warning, collision avoidance system, and rear parking sensors to help keep you aware on long hauls. - Heated, chrome, power-adjustable towing mirrors with memory, power-folding and manual extending glass for trailer visibility. Exterior & Utility - Black exterior with bed liner, fixed running boards, molded splash guards, front grille/bumper cover, smoked amber roof marker lamps, chrome mirror caps, and 18" full-size steel spare wheel. - LPO wheel locks and front license plate kit, plus trailer-ready features for heavy-duty work. Notable Equipment - Duramax Plus Package, engine block heater, Allison transmission, exhaust brake, and comprehensive trailering hardware make this Sierra a turn-key solution for demanding jobs or towing recreation. This Sierra 2500HD Denali combines premium comfort and advanced features with true heavy-duty capabilit