Sorry for the delay, I got called to duty at the volunteer fire department, I get called without notice sometimes, afterward I often come home and crash a couple of days getting up for work only. (getting to old for this stuff now) Below is an Ebay link to the type of old convective furnace
I am talking about, most "rusty" people on this site know about them...You might put a call out out on the F.B.R.V. website for one of these older units asking if anyone has one they have removed?...The example I have sent is a side discharge vent/air supply tube type, you most likely have a need for a rear discharge vent/supply tube type...I do not know the inside design of your trailer to advise you which way you would go. These older furnaces are well loved and [b]often
recycled. Ebay has a steady consistent parade of them which has reliably turned up on their site. The Canadian Ebay site had allot of them. The old suburban brand that was put into the 70s era Acorns and latter into early Scamp
13s were very small and good.
You sound like a savy person who knows how to camp, glad you were never in any danger, safe camping always and good journeys in the future.
F.Y.I. if you decide to purchase one of these furnaces I have the outside vent/air intake assembly to this type of furnace
in my shop in storage, this is the assembly that sits outside the trailer, you are welcome to it.
Can you post more detail about the "old furnaces" you mentioned will produce 16,000 dry heat btu's