Mr. Heater Big Buddy Indoor/Outdoor Propane Heater

We use a ceramic (electric) heater in our TT and I usually have to turn the thermostat down as it gets to darn hot.

We used a pair of buddy heaters to heat our travel trailer while dry camping in a state park. They worked great, but I did find myself double checking the CO detectors.

On high mine will heat my big 5er from 60 to 70 in about 5 minutes. But I still prefer the furnace. Quieter and more even heat. And Mr Heaters really go through those cylinders fast on high.

I'm in a dry climate so I didn't notice any moisture.

They create a lot of moisture unless your someplace really dry. Also, while they are pretty safe I would not sleep in a small area with one running.

I have one.. puts out a whopping amount of heat with no CO worries.

I dont know offhand the specs of the furnace in our camper, but our pup is a little smaller. Nonetheless, there is a carbon monoxide detector on the inside. Yours should have one too. You can locate it in the manual (or online) and test it similar to a standard smoke detector. You could buy an after market one as well, but I'll bet my dollar that you already have one.

Look into the Camco Olympian wave heaters, safer units from what I have read and use less propane too.
3000 btu unit is listed as suitable for 130 sqft, I know canvas sides lose a lot, but a 6000 may well be enough.