The 2018 GMC Sierra 3500 is a heavy-duty workhorse built for serious towing and hauling. With the available Duramax 6.6L turbo-diesel V8 and proven Allison automatic, it delivers strong torque, confident grade-climbing, and integrated exhaust braking for controlled descents. A fully boxed frame and heavy-duty chassis support demanding loads, while available Denali comfort adds leather-trimmed heated seats, IntelliLink infotainment with Apple CarPlay and Android Auto, and trailering camera aids. Ideal for towing fifth-wheels, campers, and heavy trailers, this dependable dually is ready for both work and play.