Don't let me distract you from playing with your new toy. You can answer these questions in the dead of winter if you want.
I'm just curious about your current verses original: wiring box location(s) and fuses, battery charger (deep cycle or 2x golf cart), 12v to 120 v inverter? 120v outlets, 12v "lighter type" outlets?; I surmise the plumbing is restored to original in tanks (fresh and grey), and water pump and hosing.; Heater? A/C? Stereo? (quadraphonic? ;-) Lights are 120 v, 12v auto "dome" type? Any conversion to CFL, LED?
I'm trying to date my trailer, too! Best guess is mid to late 1980's. Born as a vinyl siding demo unit. I'm finding vecro hooks as a tape around the frame, so it must have had a still standing "skirt." (Hmmm, must be a female trailer then, unless it was a kilt? ;-)
I have personally known the trailer and even drove the tow vehicle for it over the past 8 years. The owner died and the family offered it to me, for a fair bid. I went with 10 hours general/semi-skilled labor to help get the place ready for sale. (the home of the person I had known.) So if that weren't fair... That owner had used it to haul chicks and rabbits to kid's birthday parties. (caged)
So other than what you saw, outer shell, there was nothing there inside, (but blank canvas. ;-)
Makes me curious about other "one of a kind"'s. And modernizations and refurbishings, and assorted "blank canvases" to the modern world.