Trucks move over 71% of the nation’s freight by weight. 11.49 billion tons of freight, primary shipments only, was transported by trucks in 2018, representing 71.4% of total domestic tonnage shipped. To carry the loads, these large trucks require a wide variety of trailers. Trailers are attached to the trucks as an extra carrier vehicle. They have no engine, only a chassis and wheels. This article reviews some of the basic types of trailers that operate in Texas and the United States.