I have just spent a scintillating day replacing the Knott brakes, Tow Head and pull rod on my braked trailer. Total cost of Parts including the tow head and brakes etc was £350 and doing the job was not fun...... But many thanks to the You Tube video postsd by Trailerguy which made the job loads easier than it would have been if I was left to my own devices.
Many thanks. Here are a couple of before and after pics. I have to say that as far as braking is concerned I feel like we are all fighting a loosing battle if we dunk our trailers in that salty stuff