We're shopping for a late model 5th wheel, and we will likely buy a model from a couple years ago with "boring white" plus decals. I won't ever be buying any RV in a dark color.
The simple reason: white reflects heat, dark colors suck it in. This is the practical reason that traditionally, up until a couple years ago, most all RV's were white (with decals). RV's aren't insulated like houses, so it's a practical concept that matters to me, perhaps more than to some because I live in Southern Arizona and our RV is stored next to the house in the sun.
One hot day last summer I put my hand on the dark decal and it was so hot I couldn't hold it there. I could hold it on the white fiberglass.
Just noticed last week that the decal is now cracking.
I've got a thermal laser and someday will temp them both.