A receptacle assembly for a vehicle-trailer wiring connector assembly includes a receptacle housing, a housing opening, a first receptacle connector, and a second receptacle connector. The receptacle housing includes a first cavity extending from a first end to a central structure. The housing opening is defined at the first end. The first cavity and the housing opening are shaped to enable insertion of a plug assembly constructed to comply with the Society of Automotive Engineers J2863 standard. A first portion of the first receptacle connector extends from the central structure into the first cavity. The first receptacle connector is sized such that the first receptacle connector is configured to be inserted into a connector cavity of the plug assembly. The second receptacle connector is disposed and positioned on an interior surface of the first cavity and is contactable within the first cavity.