Kenworth is a manufacturer of meium and heavy-duty Class 8 trucks based in Kirkland, Washington, United States, a suburb in Seattle. It is a subsidiary of PACCAR, and is also a former manufacturer of transit buses and school buses. The brand claims to maintain an image of high quality, it has won five of six JD Power Awards in 2005, and was a clear sweep in the 2007 J.D. Power Awards for Heavy Duty Truck Product Satisfaction .