I don't have advice on your problem, except to say that all trailers use one of just 1-3 different brands of camper appliances. They're all the same. The make and model of the actual furnace
will be more helpful. Brand of camper doesn't even matter when it comes to 90% of the systems in the trailer.
If you post in the Problem Solving area of the forum and just list the problem, the brand of furnace
, and more specifically when it does and doesn't work, people will definitely have advice for you. It's going to be, I'm guessing, either an atwood/hydroflame or suburban. Something all fiberglass trailers with heater have.