Originally Posted by noserider
That 4 flat plug is the same as mine.
So it is! We've gone around in circles talking about various genders that I lost track of what we're talking about.
So, it looks like the plug on your system is designed to be mounted on the front of your toad, and an umbilical just like you posted is used to go between the two vehicles. I still don't understand why they didn't just go with the proper trailer end on that harness, and then the umbilical would be an extension cord with male prongs on the MH end, and female sockets on the toad end. As it is, with the double male "suicide cord" it defeats the purpose of the female powered sockets: if the cord is plugged in at the MH end, then the male prongs are live, and it could accidentally short against the tow bar or other metal while hooking up the toad. It's still a curious choice of genders.
I think you have a good idea going with the 6 pin round connector. It's cleaner, and I think they mate a bit better. Plus you will have some extra wires, so you can easily run a toad battery charge line, and still have a wire left over for a brake system or other purpose.