The “Legendary Package” is a special version of the Class 8 Model 589 range with retro styling and vintage Peterbilt branding inside and out.

Both configurations feature a body which Peterbilt said it developed in collaboration with “leading” car carriers.

For the first time, the Model 579 will incorporate automatic “stop & go” functionality for resuming a pre-set cruise speed after an automatic braking event.

Built for the U.S. Department of Energy’s SuperTruck II programme, the prototype truck, described by Paccar as a “testbed for future product technologies”, was developed in order to improve freight ton efficiency by 100% compared to a 2009 baseline.

Massey Motor Freight of Nacogdoches, Texas acquired the 100,000th model, a limited-release ‘Model 389X’ special edition vehicle.

The Primaax EX is recommended to customers who need trucks for vocational and heavy haulage applications.

The TX-18 Pro automated transmission will come with two new features: Off-Road Calibration and Rock-Free Mode.

The Model 589 also features Peterbilt’s latest advanced driver assistance systems, including collision mitigation and predictive cruise control to improve safety and fuel economy.

The truck – a Peterbilt Model 579 – featured a Cummins ‘X15H’ engine, providing up to 500 horsepower (372 kW) and up to 1,900 lb-ft torque.

Both companies will be making Class 8 electric trucks using fuel cell drive systems developed by Japanese firm Toyota, with Kenworth aiming to begin customer deliveries next year.

The programme - which covers servicing of Paccar MX engines, electrical systems, and braking and suspension systems - will provide students with nine factory-trained technician credentials, which Peterbilt claims will help fast-track them to careers at one of its North American dealerships.

The deal will mark the first time that ZF’s OnTraX system for lane keeping assistance has been installed in a commercial vehicle platform in North America.