| 摘要 |
A dual trailer has a first trailer with a king pin for a tractor and a rear fifth wheel for the king pin of a second trailer. The rear end of the first trailer and the front end of the second trailer is lifted into an empty transport position so that the first and second trailers are supported solely on the tractor and the rearmost axle of the second trailer. The remaining axles are held raised from the ground by the lifting of the trailers and by an individual lifting hook supporting the axle raised relative to the frame. In the empty transport position, the first and second trailers are maintained as a single integral trailer in a directly aligned position. Each axle includes an air bag so that the hook is engaged when the axle is raised relative to the frame by releasing the air from the bag.
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