We have been discussing this Via PM.
Until we get the issue diagnosed we cannot lay fault on anyone. Once we get the issue diagnosed we can go from there and decide where, if any fault lies. It could just be an unplugged harness.
If your back up lights work, your toad lights work, but your brake lights do not I would start working towards your toad harness and tracing the wires back to the source of power.
PS. Though I am here discussing Forest River Product I am no more a part of Forest River than you are. When I am here it is of my own free will, time, and knowledge.
PLEASE do not send questions via Profile comments or Private Message, my inbox fills up too quickly. Post questions in the forum as a new thread so that other users can benefit from the answers. Use Private Messages for sensitive information only (VIN, Contact info or things you do not want the public to see).