TOWD Tail Lights Isolation Network

I like to Label my wiring to make it clear what is happening if I need to resolve and diagnose a problem. I use reverse light control because the coach is wired for reverse lights. The reverse light circuit is used for my stainless disc brakes on my boat trailer to disable the surge brakes in reverse. Really, you should avoid having to back up with a TOWD and 4 wheels down because the steering geometry does not work for you going backward. Reversing can cause all sorts of problems.