I have used a Pelonis 5-disc furnace for the past several years when the weather gets cool and it has always worked great. Set it on the kitchen counter with a small fan set on the table against the back window to help circulate the air to the front of the trailer. We had 25-degrees last week in Minnesota and the Pelonis kept the camper a nice 68-degrees using only the 3rd setting.
2015 Rushmore Springfield
Disc Brake upgrade, Goodyear G614 tire upgrade
RV FLEX-ARMOR roof, Mor-Ryde IS suspension
2017 F350 Dually 4x4 6.7 Bronze Fire