In a way RVs are like boats. They can be any colour as long as they are white.
Gelcoats on RVs are not very thick to begin with. Gelcoat is heavy & it is expensive. Paint is good but it is also very expensive & needs marine quality paint & multiple clearcoats if one expects to get some life out of it.
Actually colours can be OK however they must be very light. An off white of some colour. Boats that are eggshell, a very light lemon yellow, a very pale powder blue or similar stand up fairly well.
Refridgerator white is simply too white. My Alpenlite is refridgerator white. Hate the look. Looks like a big chest freezer on wheels. The white does stay cool in the heat however.
Dark colours attract & hold the heat. Useful if you open camp when it is cold. Makes you A/C work in the heat of summer.
The graphics are another matter. Most RV builders use cheap material. High quality marine grade material will last much longer.
The problem with RV buyers is that we all want quality materials but we want a cheap price even more. The builders cut corners wherever they can to meet that price.