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Choosing the Right Security Lock For Your Van Choosing the right security lock for your van could aid in preventing theft and protect your cargo. Certain locks can be put in by the homeowner, while others require professional assistance to ensure they are properly installed and offer maximum security. Slam locks are great for couriers who have multiple deliveries. They lock automatically when the door is closed. Deadlocks are designed to work with your manufacturer's lock and provide an extra layer of security.