Introducing the Model 579 UltraLoft with an integral cab-sleeper design, the UltraLoft takes the already superior Model 579 to a new level of driver comfort and performance. The distinctive, bold exterior features a sculpted roofline optimized to achieve a smooth airflow around the vehicle.

The Model 579 UltraLoft also features a brand-new standard sun visor with integrated marker lights as well as extenders and closeouts to deliver a 2% improvement in aerodynamic efficiency. On the brand-new sleeper, large, tilting upper windows allow more natural light inside the cabin, and full-height doors provide easy access to the luggage compartment. With the addition of the new Model 579 UltraLoft, Peterbilt now offers the most comprehensive lineup of fuel-efficient, aerodynamic trucks in the industry.