567 and 589 tractors, the Paccar unit said March 25. Peterbilt’s flagship Model 579 tractor is available with an MX-13 or MX-11 engine. The Model 579 is also available with the Paccar TX-12 ...

The global economy depends heavily on tractor-trailers to deliver goods ... which is used in Peterbilt model 567 and 579 ...

The Peterbilt conventional Model 567 was specifically designed to withstand the demands of dump, logging, construction and other harsh vocational applications. .