Many years ago, the industry worked to ensure the law allowed for short distance hauling of boats on trailers without needing to meet some stringent trailering requirement. The law carves out certain transports from key definitions.
https://codes.ohio.gov/ohio-revised-code/section-4501.01
(M) “Trailer” means any vehicle without motive power that is designed or used for carrying property or persons wholly on its own structure and for being drawn by a motor vehicle, and includes any such vehicle that is 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, 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 road or highway at a speed greater than twenty-five miles per hour, and a vehicle that is designed and used exclusively to transport a boat between a place of storage and a marina, or in and around a marina, when drawn or towed on a public road or highway for a distance of more than ten miles or at a speed of more than twenty-five miles per hour. “Trailer” does not include a manufactured home or travel trailer.
https://codes.ohio.gov/ohio-revised-code/section-4513.32
Every trailer or semitrailer, except pole and cable trailers and pole and cable dollies operated by a public utility as defined in section 5727.01 of the Revised Code, shall be equipped with a coupling device, which shall be so designed and constructed that the trailer will follow substantially in the path of the vehicle drawing it, without whipping or swerving from side to side. Vehicles used to transport agricultural produce or agricultural production materials between a local place of storage and supply and the farm, when drawn or towed on a street or highway at a speed of twenty-five miles per hour or less, and vehicles designed and used exclusively to transport a boat between a place of storage and a marina, or in and around a marina, when drawn or towed on a street or highway for a distance of no more than ten miles and at a speed of twenty-five miles per hour or less, shall have a drawbar or other connection, including the hitch mounted on the towing vehicle, which shall be of sufficient strength to pull all the weight towed thereby. Only one such vehicle used to transport agricultural produce or agricultural production materials as provided in this section may be towed or drawn at one time, except as follows: