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Choosing the Right Security Lock For Your Van A good security lock can deter thieves and protect your cargo. Certain locks are designed for DIY installation, while others require help from a professional to ensure they are fitted correctly and provide maximum security. Slam locks are great for couriers who make a lot of deliveries. They lock automatically when the door is slammed shut. Deadlocks are designed to work with the manufacturer's lock and provide an extra layer of security. Deadlocks Van dead locks are a further physical security mea