You can always click on Orman's name on one of his posts, which will take you to his member page, and send him a PM or email from there.
No, we should never touch the Coach Power switch by the door - it isn't designed for repeated owner use, which can really cause problems... been there done that; I've considered removing the switch altogether to remove its temptation.
My master switches are above the batteries, but I understand some coaches don't have them. Some owners have installed their own, purchasing switches at marine supply stores. I would think one of your vintage would have a factory set, one for the house side and one for the chassis side. They should be near the batteries, to take advantage of short, large, high-amp wires.
Joel