Not sure I understand the relay issue limiting a full bargmann connector. There are three additional wires that need to be added.
1. +12V DC supply to charge battery. This is nothing more than a heavy gauge wire ( #10) from either the battery or a major 12V buss through a fuse to the 12V pin on the connector.
2, A wire from the output of the electronic brake controller to the brake pin on the trailer connector.
3. A wire to the backup light pin on the connector, may want a small relay here depending on fuse size for the TV B/U lights.
4. I would replace the ground wire on the bargmann with a heavier one with the other end connected to a solid frame ground on the TV.
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