nice pic and beauty of a truck!! hope the bobbys don't mind the passenger driving?
don't think it's the lack of forced drying that would make the paint more likely to chip, but more the quality of the job - like paint sticking to primer and primer sticking to metal - but prolly not even that, just that paint on metal doesn't take well to direct hits w/ stones, which is why the show truck folks make their sissy trucks wear a bra on the highway
martinsr might have a solution for ya
Bill