The Dealer Key System is a revolutionary and patented concept in trailer locking systems. Bauer Products, Inc. is pleased to announce our patented Dealer Key System (U.S. Patent No. 6,701,761). This system was designed specifically to meet the “one key” goal that many of the trailer manufacturers are striving to attain. The concept of these locks is to have only one lock cylinder per latch as a means of convenience. The Dealer Key System features a lock cylinder that “changes” once the Customer Key is inserted to prevent the Dealer Master Key from operating the lock. The shape of this key is distinctive so there will be no confusion to the customer about which key is for the trailer.