We have the same unit. Key question for me would be is it a superficial surface crack or a stress crack going deep into the fiberglass and if so what is the cause and will the crack spread. Can not tell for sure from your picture, but looks like more than a superficial to me. If you determine it is just a surface crack, waterproof caulking should suffice. You are right, no water damage wanted.
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Mike and Lorraine
2002 3655 FL, 2005 3650RK
2010 3665RE, 2015 3910FB
F350 crew cab dually 6.7
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