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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 safeguard your cargo. Some locks are made to allow DIY installation, but others require help from a professional to ensure that they're properly installed and provide the best security. Slam locks are perfect for couriers who make a lot of deliveries. They lock automatically when the door is closed. Deadlocks are designed to work with your brand's lock and provide an extra layer of security. Dead Locks Van dead locks