The Hanson Truck Company is owned by the Hanson Aggregates Pacific Southwest Company which is located in nearby Carlsbad. In 1977 it purchased the LeHigh Cement Co. and now is one of Southern California’s chief suppliers of construction materials. It produces aggregates (crushed rock, sand and gravel), ready-mixed and pre-cast concrete, asphalt and cement-related materials. It also makes building construction products including concrete pipes, concrete pavers, tiles and clay bricks.