Why not use 12 volts for your camper. 12v items are more and more available today . Microwaves, a/c , will require a generator /or shore power anyway. TV 's are 12 volt, lighting and most everything e...
JCR-1 seems to enjoy battling with windmills. It is extremely naive to believe that any heat producing device in 12vdc is as good as the 120vac device.
It isn't unusual for new members to come on here being naive about why everyone doesn't do things they same as themselves. JCR-1 is not a new member although this thread appears that way.