A kingpin assembly includes a kingpin pivotally coupled to recessed mounting means positioned with an aperture in a relatively flat surface of a vehicle. The kingpin is movable between a locked upright position during use to a horizontal stored position when not in use. A locking mechanism is also pivotally coupled to the recessed mounting means and provides the dual function of covering the recessed mounting means when the kingpin is in its stored position therein and locking the kingpin in the upright position during use. The locking mechanism includes a shoulder portion adapted to aid in lifting the kingpin from its stored position to its upright position.
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