| 摘要 |
A powered trailer for aiding a powered vehicle in moving a load trailer is selectively connected to the vehicle by a tongue assembly. A sensing device mounted on the tongue assembly senses the position and motion of the vehicle relative to the powered trailer. Trailer engine speed and brake control devices control the engine and brakes of the powered trailer dependent on signals from the sensing device so that the engine and brakes of the powered trailer operate in coordination with those on the vehicle.
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