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Choosing the Right Security Lock For Your Van Choosing the right security lock for your van can help to deter thieves and safeguard your cargo. Some locks are made for DIY installation, while others might require assistance from a professional to ensure that they are installed correctly and offer maximum protection. Slam locks are ideal for couriers who make multiple deliveries. They lock automatically when the door is slammed shut. Deadlocks are used in conjunction with the lock that you have purchased from the manufacturer