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Choosing the Right Security Lock For Your Van A good security lock can deter thieves and safeguard your cargo. Certain locks can be put in by the homeowner, while others require professional assistance to ensure they're installed correctly and provide the highest security. Slam locks are ideal for couriers who make multiple deliveries. They automatically lock when the door is slammed shut. Deadlocks work in tandem with your manufacturer lock and provide a further layer of protection. Dea