To carry a large-sized carried article by using a plurality of trucks having a plurality of independent turning type wheel devices.

One of the plurality of trucks is made to be a master truck MC, and others are made to be slave trucks SC. A steering controller M20 of the master truck MC is provided with a single-composition mode determining portion 32M determining a composition operation mode, a composition operation control portion 20C obtaining a composition turning center of a truck group from steering angles of steering wheels M3, S3 and computing a composition slave shaft target steering angle of each wheel device from the composition turning center, and a steering angle instructing portion M20B outputting steering instructions to the wheel devices. The slave truck SC has the steering instructing portion M20B outputting steering instructions to the wheel devices, and a transmitting cable 43A transmitting the composition target steering angle from the master truck MC to the steering angle instructing portion M20B of the slave truck SC.

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