Check the listing for details. TowSmart Pro Class Heavy-Duty Coupler Lock Kit. Condition: Open box. Listed at 35.00 USD. The TowSmart Pro Class Heavy-Duty Coupler Lock Kit is a high-quality anti-theft device designed to secure trailers and prevent theft. Manufactured by TOWSMART, this key lock type of coupler lock provides enhanced security for trailers by effectively locking the coupler to the hitch ball. The heavy-duty construction of this lock kit ensures durability and reliability, making it suitable for various trailer applications where security is a concern. With this product, users can have peace of mind knowing that their trailers are securely protected against unauthorized access or theft. 33