[KarenH]

I was amazed to see this thread, because just last night,* I was telling my son about all the connections that a camping trailer needs. This is stuff I learned about in the 1970s, and I haven't thought about for years!

Anyway, I don't know about electrical specifics, but if I were in your situation, I would not go to a car dealer; I would go to an RV specialist for any work related to the towing apparatus, whether for the tow vehicle or for the trailer. I believe that any decent RV specialist will have tons more experience with this than a regular car dealer. It would probably be worth the drive, even if you don't have an RV shop near you.

*In case you were wondering, we were discussing a show Eric had seen in which some crazy people did an experiment to see if they could stop a runaway trailer using rockets. They nearly got themselves killed, of course. As I explained to Eric, a good trailer towing package already has multiple safety mechanisms which would make it virtually impossible for a runaway trailer situation to occur.