The Freightliner Corporation, one of the best known manufacturers of U.S. Trucks with the main premises in Portland, Oregon, is a fully owned Daimler-Benz subsidiary since 1981, which is the biggest manufacturer of Diesel Utility vehicles. These trucks are known under the name "the Efficient Machine" because of their special features. Freightliner tractors are mainly used to haul heavy trailers, but they are also generally built to the customers' requirements.