Ford provided a connector with under the dash for the controller, and a wire at the rear of the chassis for the output of the controller to the trailer.
Considering the age of your coach, it's possible, but not likely, that Thor extended the Ford-provided trailer electric brake wire to the hitch connector on the coach.
Your job is to:
a) Find the under dash connector
b) Find the wire at the rear of the coach
c) Extend the wire at the rear of the coach to a six- or seven-pin connector (replacing the connector there, if needed)
d) Buy a controller and matching pigtail to connect it to the Ford connector
e) Install the controller and test
Piece o' cake.
A prior owner may have done all or part of this already.
2008 Holiday Rambler Admiral 30PDD (Ford F-53 chassis)
2009 Honda Fit Sport