I ran a Little Buddy heater in my camper as my only source of heat. I had bad condensation issues in my camper. Granted I was in Cascade mountains Washington in the winter. Installed a forced air furnace and have not looked back. It does cycle a lot in colder weather however being able to dry my clothes makes it worth while.
If you go this route look into is an insulating pack for the canvas. And put the thermostat within easy reach of the bed.