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Choosing the Right Security Lock For Your Van The right security lock can deter thieves and help protect 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 have multiple deliveries. They lock automatically when the door is slammed shut. Deadlocks are designed to work with the manufacturer's lock and offer an additional layer of security. Dead Locks V