http://renitdaniel.com/members..../estes07matzen/activ
Boat and jet ski trailer coupling locks are essential security devices built to prevent unauthorized attachment and towing of trailers carrying valuable watercraft. These locks are particularly helpful for owners who leave their trailers parked in public places, boat ramps, marinas, or storage facilities, because they secure the trailer's coupling, which makes it extremely hard for a thief in order to connect it to some towing vehicle. and Functionality Coupling locks are typically crafted from heavy-duty materials like steel