Kenworth's a manufacturer of medium and heavy-duty Class 8 trucks based in Kirkland, Washington, United States, a suburb in Seattle. It's a subsidiary of PACCAR, and's also a former manufacturer of transit buses and school buses. History Kenworth began its history in Portland, Oregon. In 1912, the company was founded by brothers George T. and Louis Gerlinger, Jr. as a car and truck dealership known as Gerlinger Motor Car Works. In 1914, they decided to build their own truck with a more powerful… (More on Kenworth)