A simple link, hinged at one end, which can act like a safety stop on a vehicle lift. If it's not locked out by the cable, it is pushed open as the hitch passes, then locks the hitch when it drops back. To release, you raise the hitch, to clear the latch, then pull the cable. An advantage is, if the lift fails, You grab the plough, lift it till it engages the latch, then trundle back to the beer tent.