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Upper Coupler - Load bearing surface on the underside of the front of a semitrailer. It rests on the fifth wheel of a tractor or dolly and has a downward-protruding kingpin which is captured by the locking jaws of the fifth wheel. Reference: Truck Writers of North America (TWNA)
Related Terms: Upper Coupler - fifth wheel | trucking |
Search History: [ Upper Coupler ]
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Ver 4, Sep, 1999, Matthew D. Cox, email@example.com
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