This Receiver and Coupler Lock Set (keyed alike) includes an adjustable 5/8" steel sleeve for Class III, IV, and V receivers; a pin for 1/2" Class II receivers; and an adjustable steel coupler pin for 7/8", 2-1/2", and 3-1/2" spans.
TRIMAX Universal Receiver Lock TS32 & TC123 Universal Coupler Lock