OK Adam,
Here we go.
I did a lot of tow, trailer wiring and I hope I can help.
First, that RV trailer connector should be 7 wire. If you remove it from it mount and pull it out where you can reach it, there is a screw in the side that will let you pull the terminal block out of the shell. The terminals will either have colors marked (hope) or numbers. Then go to:
https://www.etrailer.com/question-363.html for what they all are supposed to do.
That module is needed if the Edge has "single buld" lights. It does a mix of your coach Brake-Turn light signals to be a single Brake/Turn for a conventional domestic light set.
If the Edge does not flash brake lights for turning you don't need it, but you will also need to change the connector to a J560b. For connections go to:
http://https://www.etrailer.com/question-27196.html This is a different connector because the brake and turn are separate.
This really is not rocket surgery and you can find all the information on the internet. If you are going to tie into the vehicle harness for lights, there are adapters made that make this much simpler. I never used them, but I know that they used to exist.
Frank