Established in 1960 and proud to be known as one of the oldest horse trailer manufacturing companies in the United States, Circle J Trailers are designed and built by the most skilled and experienced craftsmen in the industry. Their elegant appearance is matched only by their durability--tough and dependable.   With more than 50 years of experience, Circle J knows and delivers what a customer needs and wants in a trailer. Based in Caldwell, Idaho, Circle J manufactures steel and aluminum exterior, and all aluminum horse and stock trailers that are known to be the standard of excellence throughout the Western U.S.