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Choosing the Right Security Lock For Your Van Choosing the right security lock for your van will assist in stopping thieves and secure your cargo. Some locks can be installed by the homeowner, while others may need professional assistance to ensure they're installed correctly and provide maximum security. Slam locks are ideal for couriers who make a lot of deliveries. They lock automatically when the door is shut. Deadlocks work with your manufacturer lock and provide a further layer of security. Deadloc