LCS001 - Ram and Bulldog 2" and 2 5/16"Secure your utility, car hauler, landscape, or enclosed trailer with this heavy duty slip collar coupler lock, custom fit for RAM and Bulldog 2 and 2 5 16 couplers. Built for durability and reliability, this lock provides maximum security for your trailer. Includes 3 keys for convenience, and the puck lock is included. Note: When installed, the couplers will remain open, while 2 5 16" couplers will stay in the closed position.