"mprumsey"......I know it would be nice to have a box full of brochures, but they wouldn't really tell you much. It's pretty simple. Your coach is built on a Ford chassis. I'm guessing it still has the 460 engine.
All of your appliances are made by manufactures that are still around. You can do as search on most of your stuff, like a Wedgewood stove or Dometic or Norcold refer and still find the manuals. Download them if you think you need them. Same with the generator. That would probably be a manual a would download and have available because they did have some settings for altitude.
Wiring is wiring and most older RV's are all wired the same way. Your biggest issue will be identifying switches that a previous owner added and trying to figure out what they do.
Often one of the things that goes bad on the older coaches is the battery jumper, that jumps the house batteries and the coach batteries together when one set is low. Again, a pretty standard wiring format.
Don & Mary
2019 Newmar Dutch Star 4018 (Freightliner)
2019 Ford Raptor