Not trying to convince you to go with another company, but talk to Roadmaster. I just went through all these questions with a new Ford Explorer. They were able to tell me exactly what parts I needed, which wiring diagrams to use, even the color of the wire I was trying to trace on the Explorer. They were extremely helpful and happily answered my questions over many phone calls. Not sure what they will suggest for the braking system, but the lights aren't a problem. They get their power from the motorhome.
Brian, Mary, kids, beagle - Moose, and mutt - Maggie.
2012 Greyhawk 31FS
2013 Ford Explorer Toad