It doesn't take a rocket scientist to know that black absorbs heat. I would only order a white RV as we are in the sun a lot and RV is stored in a sunny location. We do a lot of boondocking and don't need the heat of the sun warming up the interior. Also, when the colors start to fade, what kind of a trade in value are you going to get?
Another gripe I have about newer RV's. The dark interior colors and sometimes a lack of windows or small windows. I guess many are made for RV parks only where everyone uses electric lights instead of solar or battery power.