I'm not advertising, but I do have a Hippajack board.
It came with my TC but seller did not have the remote, nor motors, so I bought a new everything.
I can't remember if this board works or not. Maybe I never tested it, or maybe I used it then later replaced with the new board.
Maybe it would be easy to test.
I bought the camper without motors, so had to crank by hand. I guess the motors I bought came with a new board so thats how I ended up with a new board.
It operates on wired for sure. The wired uses a phone cord as the wire. I do not know about wireless as there is no antenna wire like the new ones have.
My new one had the phone jack and also was wireless. The controller could do both.
The old one is in a box and to me is worth less than what you are talking about having to spend... just saying.
Etrailer dot com sells these.
There are no control buttons on the motherboard, so no way to test it without the remote or to jump the phone jack wires and I do not know what terminal to jump to test it, or if is using a switched signal or computer gibberish signal.
That's my entire story. Hope you enjoyed.