Founded in 1923, Kenworth Truck Company is one of the leading manufacturers of heavy and medium duty trucks in the United States. It operates the PremierCare Roadside Assistance Center. The company maintains a network of dealers in more than 290 locations in the United States and Canada. Kenworth Truck Company is a manufacturer of The World s Best heavy and medium duty trucks. The company offers a fleet of vehicles that includes the Kenworth Clean Power no-idle systems, medium duty diesel-electric hybrids, and aerodynamic and liquefied natural gas trucks. The company operates manufacturing plants in Ohio and Washington in the United States and Quebec in Canada. It is a division of PACCAR