Hello,
As it turns out there was an inline fuse holder on the red wire connected to the furnace. It was a little hard to get at, but once I found what I was looking for I was determined to get at it. It was easy to open with just a simple twist and low and behold there was a blown 250V 4AMP glass fuse
I guess with the smaller tent trailers the fuse boxes aren't quite so elaborate as yours
Cheers,
Bentwookie