Tow more than one trailer Take advantage of your existing 4-Flat when adapting. The 47185 attaches to an existing 4-Flat to bring the lighting functions to the 7-Blade and 4-Flat connectors, leaving electric brakes, auxiliary power, reverse lights and ground as the only functions that need to be wired. The Multi-Tow design feature adds multiple towing options from one connector by providing sockets for towing both 7-Blade and 4-Flat trailers.