ULTRALOFT! This 2021 Peterbilt 579 is Powered by a 450hp Cummins X15 Engine and Paired with a 12 Speed Automatic Transmission; 80in Double Bunk Sleeper with Rear Bunk Controls; Air Slide 5th Wheel; DOT Inspection and FULL PM Service! 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.