The idea of having a forced air electric heater in a camper is really not a bad idea, provided there is also a gas forced air heater as well. Just like water heaters that are both gas and electric, a dual furnace would, actually, be wonderful! My concern about REPLACING the gas for electric is what happens in the event of power failure, which happens sometimes in even the very BEST campgrounds and RV parks. So, the option to flip from electric back to gas would always be there.
Regardless of one's idea of the cost of electricity, it's a good idea. And by the time I get ready to buy a new camper, maybe this type of system will be just as common as the gas-electric water heater!