ULTRALOFT! This 2021 Peterbilt 579 is powered by a 450hp Cummins X15 Engine and a 12 Speed Automatic Transmission; Adaptive Cruise Control; Collision Mitigation; Lane Departure Assistance; Air Slide 5th Wheel; FULL DISC BRAKES; Hood Mirrors; Heated Mirrors AND this truck is an Ultraloft Sleeper meaning it has one of the largest bunks out there with an 80in Double Bunk Sleeper; Refrigerator; Microwave and TV Prep; Air Ride Drivers Seat with Lumbar Support. Ton of Options on this truck! Coming with a DOT Inspection as well as a PM Service! Contact your local sales rep today! Vehicle specifications; options; mileage; and availability are subject to change. While every effort is made to ensure accuracy all information should be verified with a sales professional prior to purchase.