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

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