You can do a internet search for Hughes Autoformer, find the company, find a local dealer, and buy one, have them install it.
You can also have a local electrician install it too. There is only input wires from your cord reel, and output wires to the RV where they disconnected the wires to the cord reel.
Congratulations on the new power cord reel! I hear they are nice to have. Personally I would rather put up with the portable cord that plugs into the side of the RV than desire to spend $1,000 on a power cord reel. . .
AS for a extension cord. It is always best to camp as close as possible to the RV power inlet cord location, to not require a extension cord. But if you should need it, then I would be using a portable 25' - 30' extension cord, and not putting it on the reel.
The reel will act like a transformer to some extent. You will have 4 wires going around the reel, however if it is really long part wound up on the reel, then it can overheat and act like a transformer. It is best to wind out most of the cord - especially on a hot day, and avoid leaving more than 2 winds left on the cord reel. Say that the cord is 1/2" diameter and the reel is 5" wide, leaving space for 8 or 9 cords side by side, and two layers would leave about 10 - 20 feet of cord on the reel, and still not get hot. But if you leave it all on there, it can overheat. something to check on a warm day, when 2 A/C units are running.. . .
Have fun camping!
Fred.
