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Choosing the Right Security Lock For Your Van A secure lock can deter thieves and secure your cargo. Some locks are made to be used for DIY installation, while others might require assistance from a professional to ensure they are installed correctly and offer maximum security. Slam locks are ideal for couriers who make a lot of deliveries. They lock automatically when the door is closed. Deadlocks work in tandem with the lock that you have purchased from the manufacturer and offer an additional layer of security. Dead Locks Va