Trailer hitch wiring; is this what I think it is?

The TowSmart Electrical Connector is the quickest and easiest way to make electrical connections between your vehicle and trailer when towing. The

21 ft., 4-Way Flat Trailer Light Wiring Connector

Trailer Wiring Harness Extender

Genuine BMW - 71602156526 - Trailer Hitch Wiring Harness - E70 X5 (71-60-2-156-526)

Can trailer hitch wiring be used to add a 12 v outlet?

Genuine Ford Trailer Hitch - Wiring Harness 4/7 Pin Kit - JK4Z-15A416-B

Trailer Wiring Diagrams

Wiring S-10 Forum

Porsche Cayenne Trailer Hitch Wiring Harness 95561250600 —

Genuine Mopar Trailer Hitch Wiring Harness - 82216107AA