I have not tried an electric heater when camping but I did use one last winter while the RV was in the driveway and I was getting ready to go to Florida. I did not want the water pipes to freeze after flushing the RV antifreeze. I used one of those 1500w heaters that look like an old radiator. It did keep the temp above freezing inside when 25 F outside but it never got warm enough to take my coat off for the 2 days it was on.. The propane heater got the temp to 65 F in about an hour just before I left. If its just chilly out and you need to move the temp 10-15 deg OK but if it is really cold out forget it.
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