FG16's were only built for 3-4 years in the early 70's and were, for a while, a Stewart Gardner Company (Sunrader Toyhomes) and then a joint venture with KOA (Kampgrounds of America). I have looked at several and, while they have an excellent floor plan, I have yet to find one for sale
in decent condition.
You need to know that several years had a combination Stove/Oven/Space Heater, called a Duett, that was ordered recalled due to co leakage when used as a space heater. BUT: As there is also an optional 11,000 BTU furnace
listed, not all FG-16's had that unit installed.
There is a sales literature in the documents section somewhere