My boat trailer has surge brakes that do not work. I have attempted to blead, but I think that the master cylinder in the coupler is bad. I would like to convert to electric brakes as my SUV is pre-wired for a trailer with electric brakes. The problem is that the coupler will need replaced. Can I retrofit with a stationary coupler and remove the old one that was for surge brakes by cutting off the brake line? Also, where can I buy electric brakes at? To instal do you change out the entire hub? Thanks for any advise.