A universal equipment trailer allows the trailer to connect to a variety of towing vehicles, whether the towing vehicle uses a standard trailer hitch or kingpin hitch. A hydraulic or pneumatic system on the trailer can raise or lower a coupling assembly to place one of two available connectors in position for linking to the vehicle hitch. Because the coupling assembly locks into position once raised or lowered, the connection between the towing vehicle and the trailer is secure. The parts for the universal equipment trailer may also be supplied as a kit, allowing conversion of standard trailers to universal equipment trailers.