My chrome trim was loose on my coach as well, I noticed it while I was cleaning my head lights. The trim around the headlights is attached with small machine screws with lock washer and nuts, they work loose and require tightening periodically. I suggest you do not over tighten these screws as you could chance cracking the trim or the fiberglass front end. I have placed lock tight on the treads which to date has solved the problem. But I still regularly check them along with lots of other things. Seems like something is always working loose from the highway vibrations.
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