Electric Brake Anti-Sway Device
My Holiday Rambler, which was manufactured in 1995, had some extra wires that seemed to go nowhere. I found one end of them at the hitch.
When I took it to an RV service tech for some unrelated repairs I asked about the wires. The technician told me that an anti-sway device was available as an option on this trailer, but my trailer didn't have it installed. These wires were for that device.
It was supposed to work by sensing sway and applying brakes on one side to counter the sway. According to the technician, the system didn't work well and was discontinued.
I don't know whether or not his explanation is true, but it's certainly plausible. I had never heard of this system before, and haven't heard of it since.
I would guess that with today's sensors, such a system could be built.
2012 New Horizons Travel Trailer (formerly an Airstream owner)
2008 Dodge 2500 diesel with Equal-i-zer hitch.