The doghouse heater/air conditioner gave me an idea. Tell me if this is silly. Since I would only need the heat late in the year, like October and November, why not make a heater that was external like the doghouse. The heaters in most travel trailers are ducted, I could build a box that sat outside and housed the furnace and run the duct up into the floor. That way if I wanted heat for the trip, I could throw the heater inside and take it with me. That way it won't be taking up valuable realestate inside the tear when I don't need it. I could probably pick up a used furnace at the salvage yard for less than 50 dollars.
I could do the same with an air conditioner, which is only needed here in Michigan for a couple of months of the year. Plus if we are going wilderness camping, I wouldn't need to bring the air conditioner as there is no power.
Any thoughts?