I don't have one on my coach, but have had them for sports cars in the past.
I think their big benefit is to deflect road debris while in motion.
A big caution was to not let water gather between the bra and the painted surface. If the black bra were then exposed to sunshine the water could get pretty hot and damage the paint.
If it were me, I would remove the bra for storage... although I doubt it makes much difference if you're in a covered spot.
Rick, Nancy, Peanut & Lola our Westie Dogs & Bailey the Sheltie.
2007 Itasca Ellipse 40FD