AVION Travel Trailers

I am restoring a 1960 Silver Avion. The unit is 25 feet long including the tongue and back bumper. The furnace
Is missing. So I don't know the correct size in btu's and physical size to fit in the space built into the trailer.
Does anyone have the information? Thank you.

Hi, I just joined. I am starting the restoration for a friend. Do you have any information of who might have some parts. Trying to keep original. I need some rear tail light lenses, a furnace to mention a couple of needs.
Any help would be appreciated. Thank you,