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Chocking the wheels of an LP Gas bulk truck or transport is a safety measure that must be taken to prevent the vehicle from rolling while it is being loaded or unloaded. During these operations, the vehicle may be at risk of movement due to the weight shifts that occur when material is being transferred. By placing chocks behind the wheels, operators ensure that the vehicle remains stationary and secure, minimizing the risk of accidents or spills.

This practice is essential regardless of the surface's incline or whether the truck is on flat ground, as loading and unloading can create conditions that might inadvertently cause movement. While other scenarios, such as being on an incline, may suggest a higher need for caution, chocking should be a standard part of the loading and unloading process regardless of the vehicle's positioning. Therefore, this choice underscores the importance of consistent safety practices in handling LP Gas transports.