Proven Lock GRB-78

The Proven Industries GRB-78 coupler lock is made specifically to fit gooseneck trailer couplers from Ram and Bulldog brands - it's engineered for those exact coupler shapes and sizes used on heavy-duty gooseneck trailers. It won't fit all couplers (for example, it is not compatible with the Bulldog BX1 series), so you should confirm your coupler style before purchase.

This model is designed to snugly lock over the gooseneck coupler, providing theft deterrence and secure protection while parked or in transit.