Trailers come with special features that help you for various purposes. They evolved from simple four-wheeled vehicles pulled by the tongue of a horse or machine. Finally, the tongue and forearm are eliminated, and the front of the towing unit is directly connected to the pin at the rear of the towing unit. The hinges also evolve from a primitive pin mechanism to a ball connecter to 5th wheels and gooseneck connecters. Trailer manufacturers provide highly durable trailers that help you in various purposes.