I also have a plug in car, be very careful the plug for the car charging is probably 220 volts on 50 amp breakers. if you plug your RV into a 220 volt house plug you will smoke a bunch of circuits in your RV. The 50 amp service for RV's is 2 separate 110 volt circuits (it is possible to feed a 220 volt appliance in an RV but the breaker in the RV intended for the 220 Volt appliance would then have to be wired for that purpose).
Looking at your pictures I would say Iggy is correct that the plug is missing the neutral wire for use with an RV, but it is also possible the plug is wired at 220 volts just saying you better be sure what you are dealing with or it could get very expensive very fast.
Dale & Terri, Lulu & Tiki (our Chihuahua's), New rescue puppy Prince - Pom/Pug mix.
2013 Tundra, Double Cab, 5.7, TRD Off-Road, 4X4, Full Tow Package
2013 Wildwood T26TBSS - Sold
2000 Gulf Stream Sun Voyager M-8357 MH, Ford Trident V10 Gasser, 35 foot.