Looks to me like the seams definitely need a good cleaning and caulk applied. Bear in mind that the caulk is the only thing that holds the fiberglass roof in place and prevents it from tearing off in the right wind conditions. I generally find about 6 inches needing re-caulking when I do the 6 month recommended check. The areas that I repair look like the entire seam in your picture. If you can push the fiberglass in at all, then it needs caulk. The recommended caulk for our unit is Manus-Bond 75-AM and it can be ordered from Lichtsinn Motors in Forest City, IA.
Happy Trails,
Al