I use the standard 7 plug on the coach to a 6 pin round on the toad. Never set one up, without having a spare wire or two in your umbilical cord. You may want to add, at a later time, a battery charge wire or dash indicator light letting you know that the brakes are being applied.
I like using the round connectors that have the "catch" on them where the door lifts up and locks the plug into place.
I run the coiled type umbilical as I also run an airline for my brakes and emergency breakaway cable. I route those through the coils.
Now for measuring......You need to connect your toad to the coach as you normally would for a trip. Check the length making sure you have room for full right and left hand turns. You're biggest concern is that the routing of the umbilical is not going to catch or snag on any other component. Sometimes, this takes some experimenting to make sure you have the best routing. If you use the coiled type, it should stay off the ground, yet give you the slack you need.
I've been RVing for 40+ years and towing a toad for the last fifteen. Between changing coaches and vehicles, I've had to buy a different umbilical on a couple of occasions. I keep my towing gear in one of those Harbor Freight canvas duffle bags. I keep an extra (old) umbilical as a spare. I also keep a pair of gloves, extra tow bar pin, tow bar lube and other towing related goodies in the bag.
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Don & Mary
2019 Newmar Dutch Star 4018 (Freightliner)
2019 Ford Raptor
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