With the way these RV's are thrown together I don't doubt that from time to time an outlet has been installed with the wiring not inserted correctly. But that of course does not mean that every outlet is installed incorrectly and therefore a problem. I have run a 1500 watt space heater in my trailer for many years with no problems and I will continue to do so. If you're really concerned you would have to unplug or turn off the generator and pull the outlet out of the wall to inspect. See if there are signs of heat damage like burnt or discolored wire insulation or melting in the plastic near the wire contact points. If no damage push the outlet back into the wall and don't worry about it.
