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Choosing the Right Security Lock For Your Van A secure lock can deter thieves and protect your cargo. Some locks are designed to allow DIY installation, but others may require professional help to ensure they are fitted correctly and provide maximum security. Slam locks are great for couriers who make deliveries with multiple drops as they lock automatically when you push the door shut. Deadlocks are designed to work with the manufacturer's lock and offer an additional layer of security. Dead Locks Van dead locks are an addition