As Bill notes, the idea is to maximize the voltage that reaches the lamps, which the factory configuration fails to accomplish. A couple of relays and a little rewiring does the job, but you do need to know what to do where.
It didn't cost that much to have BCS do it for us. I entertained doing it myself as per Roy and Bill's video, but since we were having other work done at Bend I just had them do it while we were there; their experience made it relatively fast (and reliable), and I could do other things with my time.
Joel