More efficient propane furnace
I have a fair-sized fifth wheel and am often surprised at both the propane usage and 12v power the furnace consumes. It is 18 years old but works good and is clean (no dirt dauber nests and so on). Ha...
Forum Discussion
The most efficient option, IMO is diesel heaters. However I don't know if there are any "drop in" RV ready applications. But with your older trailer, you could consider purchasing a couple of those.
