Our 07 190 developed a crack in the passenger side end of the drainage trough that I fixed. It was non visible so color was not an issue.
It is fiberglass with gelcoat and also as expected is sprayed chop glass in resin and not a layed mat fiberglass. Roadtrek seemed to have a "dry glass" issue in our van as we had it in the floor crack and on the roof andwhich both required repair. Dry glass is where there was not enough resin to hold the glass together well.
I ground out the dry glass and feathered in a couple of layers of mat glass and resin to fix both areas, but of course they don't turn out the right color so I had to paint that area of the roof.
In your case it is currently unknown if you have a full thickness weakness or only a gelcoat crack caused by flexing. You might be able to get a look from under the van to see if the glass looks dry or is soft with a sharp probe. In dry glass you would see glass fibers bulging out a bit, if there is adequate access to that area. If it is weak because of dry glass it would need to be ground out and repaired but if the glass is sound and it is a gelcoat only crack you probably could stop propagation by adding a layer or two of mat on the underside of the floor to strengthen the area to get rid of the flexing, but only if you can get at it. You could then either try to put something in the crack to hide it, or just leave it as is. If you mess with the topside to repair it, the entire floor pan will probably have to be painted to get uniform color and you have to use very good epoxy paint or some other floor rated paint to get decent wear.
I boat repair place can do the work but it is very expensive and they probably don't have vehicle lift. A body shop that does Corvettes could also do it, but it is not cheap.
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