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Choosing the Right Security Lock For Your Van A secure lock can deter thieves and protect your cargo. Certain locks are designed to allow DIY installation, but others may require professional help to ensure that they are fitted correctly and provide maximum security. Slam locks are ideal for couriers who make a lot of deliveries. They automatically lock when the door is closed. Deadlocks are designed to work with your manufacturer's lock and add an additional layer of security. Dead