2024 GMC Sierra 3500HD 4WD Crew Cab 172 Denali Ultimate - Preferred Equipment Group 5SB, Technology Package - Duramax 6.6L V-8 diesel direct injection, intercooled turbo engine with 470HP, Allison 10-speed automatic. This Denali Ultimate pairs rugged diesel capability with upscale touches so you can rely on commercial-grade performance for towing and hauling while enjoying a refined, connected cabin and the fuel-efficiency advantages diesel engines deliver for long-distance work.Preferred Equipment Group 5SB sharpens the Sierra's capability and composure, delivering suspension and chassis upgrades plus distinctive styling cues that help you tackle rough roads and heavy loads with greater confidence and comfort.Technology Package brings modern driver aids and connectivity that streamline daily use, making the truck's cockpit feel smarter and easier to operate on long drives or busy jobsite runs.Wireless Apple CarPlay and Android Auto let you mirror navigation, music and messaging without plugging in, keeping your phone accessible and the cabin clutter-free on every trip.Forward collision mitigation constantly assesses forward threats and can intervene to reduce the chance or severity of a frontal crash, providing an extra layer of protection in dense traffic.Front pedestrian impact prevention watches for people in your path and can take proactive steps to help avoid collisions, improving safety in city streets and parking areas.A built-in mobile hotspot keeps passengers connected to the internet on the go, so work, streaming and navigation stay reliable without draining phone data plans.The rear camera gives a clear, real-time view behind the truck to simplify backing, parking and trailer hookups, turning tight maneuvers into less stressful tasks.Adaptive cruise control manages speed and following distance automatically, helping reduce fatigue on highways by maintaining a safe gap to traffic ahead.The head-up display projects critical information into your line of sight so you can monitor speed and alerts without taking your eyes off the road, improving focus and situational awareness.Predictive brake assist readies the braking system when closing distance becomes tight, helping ensure a quicker, more controlled response when you need to stop suddenly.Steering-wheel cruise controls put pace adjustments at your fingertips so you can set and fine-tune speed without removing hands from the wheel, boosting convenience and reducing driver strain.Ventilated front seats circulate cool air through the seat surfaces for faster comfort on hot days, helping driver and front passenger stay refreshed during long hauls or summer workdays.Built for heavy workloads but finished with Denali-level comfort and tech, this Sierra 3500HD Denali Ultimate is aimed at buyers who demand diesel torque, towing durability and a connected, s