Hi! My family and I are planning a winter road trip from Florida to California over a period of about 5 weeks (December to mid January) We are South African and although we lived in the US for a year and travelled quite a bit, we have never done an rv road trip. We do not want to keep to a strict itinerary and therefore do not want to book campsites in advance. Are campsites likely to be full at this time of year? Is it possible to camp elsewhere (eg a quiet country road) should the campsites be full? If so, is it possible to operate a heater if we are not hooked up to electricity?