Abstract: A coupler for a trailer reach ball, comprising a housing to be mounted on a vehicle, a pair of pivotally mounted coupling plates; mounted within the housing and extending out of the housing; the plates pivot within a limited arc on counter rotating axis; ball receiving cups are mounted on the coupling plates, spring biasing of the coupling plates holds the cups apart; the ball receiving cups have extending projections to engage a trailer reach; a deadbolt within the housing locks the coupler around the reach ball when the coupler is closed by the insertion of a trailer reach ball.