The "all electric" coach is probably a misnomer

Would be interesting to hear monthly energy bill, but I don't think there is going to big difference between all-electric and one with propane.
AC on both work the same, even having propane furnace, most owners use electric heaters having shore power.
Refrigerators use is marginal. I think comparing such bills with knowledge of the climate would allow us to know what RV brand comes with better insulation.