My 2008 Starcraft 14RT suburban heater NT series runs us out. It is way too much heat for our POPUP. We don't use it much just for that reason. The propane furnace blower is also very loud and keeps me awake all night...
We use two oil-filled portable heaters - one in the hallway next to the door and one back in the unused tent bed end sitting on a board. This oil filled heater has a O2COOL fan setting behind it to blow some air around the trailer.
For us its better to use the CG electric then for us to use our propane anyway haha...
Roy Ken