200 holrama-
Welcome to iRV2!
Re: Trailer electric brake controller and its connections. You should be able to install a controller without having to cut, splice or run a new wire up front, under the dash. "Plug and play."
Here is a link to an adapter to fit in the Ford-factory-provided connector. The rear connector may require you to extend some existing wires to the coach hitch connector.
The trailer electric brake controller connector is buried in the dash- maybe reachable from left and below the steering column, maybe not.
See this post for an idea of what you are looking for. The dash panel should not be too difficult to remove; I have done it several times.
There are other posts in the
same thread (some are mine) that you'll find helpful.
Also, iRV2 user "Subford" has a lot of experience on late-1990s and early-2000s F-53 chassis wiring. He may chime in here.
Finally, you should add a "signature" to your profile. It contains whatever info you want; most people put info about their coach there, so they don't have to type it into each message. Instructions for adding a signature are
here.