What I find interesting among vintage enthusiasts I've met is the trend toward modernizing them to have facilities more like modern RVs.
Our 1961 TT had one LPG lamp, two 12V lamps, gravity fill fresh water pressurized by bicycle pump for one cold-water sink and to wash down the toilet, no water or 120V hookups. No shower, no water heater, fridge and wall heater used pilot lights. 12V worked from the tow vehicle battery. It would be a good dry camping TT today.
What I see more often among vintage "restorations" is addition of 120v/12V electrical systems, pump driven water supplies, fridges, furnaces that need 12V power, and even water heaters.
If you want real vintage, you might have to find something ancient to restore, a shrinking market, rather than one that has already been modernized.