The big trailer hitch connector at the back of your PC, controls a tow brake, turn signal, brake, and tail lights. You can purchase a basic wiring kit fairly cheap, maybe $80 at Walmart, which includes most or all of what you'll need to do those basics. With additional blocking diodes, the voltage coming from the RV gets isolated from the tow vehicle electrical system. That is a safeguard. At a minimum you really must have tail lights, brake lights, and turn signal lights. Simply turning on the parking lights to tow your vehicle at night leaves out the brake and turn signals. What about the day time? No turn signals and no brake lights is no good. In an emergency without them, I would turn on the tow vehicle flashers.