https://articlescad.com/the-re....asons-why-hook-locks
L4V Hook Deadlocks L4V hook deadlocks are an upgrade for front and side van doors, as well tailgates and doors for cabs. They are not tied to the locking system used by the manufacturer and secured with a high security key. Designed specifically to combat 'peel and steal' attacks this product has been tested by an independent lab increasing resistance by as much as 300 percent. It is perfect for multi-drop couriers and applications where the driver might forget to lock the door of