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...
Depends if you want to fix it right or just fix it for now. Best answer would be to remove all the old. Then remove the roof vents. Apply butyl tape under the roof vents when reinstalling them them apply the self level caulk or the eterna-bond tape. Then it will be fixed right.