We were in the trailer last weekend when it started pouring rain. Water started dripping into the trailer around both skylights. I went up on the roof after and I can see how the roof sealant is crack...
If the sealant is stuck down tight I would add just a bit of Dicor (other brands) self leveling sealant in and over the crack with the thought in mind you don't want too much of a build up to create a dam for water to sit behind.