[Richard]

On mine, the molding is held to the body by hidden clips that the trims slides onto. Slides onto, not clips onto, so you can't just pop it off. It looks to me like you take the screws out at the ends and then slide the aluminum trim off of the clips.

I discovered the clips when looking at the same situation you describe, that the trim was loose. I found the clips by slipping something thin between the trim and the side of the coach. When I saw how much work it was going to be to get the trim off, I went in another direction. I masked off the coach and the edge of the trim and forced a white adhesive into the crack. Since the coach is white it is only noticeable if you are looking for it. It did stop water from running under the trim, and it hasn't worked loose in over a year.