"Trailer" means every vehicle designed or used for carrying persons or property wholly on its own structure and for being drawn by a motor vehicle, including any such vehicle when formed by or operated as a combination of a semitrailer and a vehicle of the dolly type, such as that commonly known as a trailer dolly, and a vehicle used to transport agricultural produce or agricultural production materials between a local place of storage or supply and the farm when drawn or towed on a public street or highway at a speed greater than twenty-five miles per hour. (ORC 4511.01(M))