Grand Design to Forest River XLR......need advice....

One thing I would think would be a big factor is where you keep the camper. I have a friend who had a black Work & Play. It sat behind his house facing north. So the driver's side (west) was a nice dull black, almost grey color from the sun after about a year.

That was over five years ago and I suspect the paints are even better now. But if I couldn't keep the camper stored in the shade somewhere or at least a good UV cover, I'd stay away from FBP. But that's just me.