There have been several have this same stress crack. With the advice from others I took a Dremel tool & cut through the crack, bought some plastic H trim at a local home improvement store & after removing some trim & carefully prying the gelcoat loose from the wood backing, slid the trim on, trimmed it, up trim back on, done.
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My coach is painted, so I used touch up paint to match, the H trim I found was white.