the hayes manufacturing company limited was a vancouver-based canadian manufacturer of heavy trucks known for their durability and a revolving bunk system. founded in 1920, hayes built both highway and off-road trucks, particularly for the logging industry. on a smaller scale, hayes also manufactured buses. the signal company acquired a controlling stake in the company in 1969, and in 1971 renamed it hayes trucks. in 1975, signal sold the company to paccar, which closed the hayes plants.