I did it three years ago and so far it's holding up just fine. The truck is garaged in the winter and doesn't get used a lot which may help but the paint is still as good as when I put it on.
Repainted mine with a four inch foam roller and a gallon can of Rustoleum/ Tremclad paint. Very little cost but a lot of sanding between coats. Well worth the effort if you have the time. Like you it's just used in the summer to carry the truck camper.