This usually occurs when an owner/operator is operating their vehicle for mobility only (e.g., on the way home) and not in the course of transporting property for the motor carrier under whose operating authority they haul, and on whose liability policy they depend while they are engaged in trucking. The method of providing what is known as bobtail liability is a business auto policy (BAP) with the Truckers—Insurance for Non-Trucking Use endorsement (CA 23 09) attached.