Purchase, George & Murphey, P.C.
A: An Upper Coupler is the load-bearing surface on the underside of the front of a semitrailer. The Upper Coupler 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. This is basically how the trailer attaches to the tractor.
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