It is illegal to use a hinged plate here in MI... Because the plate is horizontal at speed and un readable and NON SWINGING! http://www.legislature.mi.gov/(S(iqa...me=mcl-257-225
So I use a semi truck mud flap cut to size. 1/2 bolted to the trailer and 1/2 to the plate. Allows the plate to move when going in and out of the water, Yet stays rigid during travel.