Depending on where you live, how it's stored, and how often you use it, you will want to either inspect it yourself or have a shop you trust inspect the roof for sealant/caulking around all the things that protrude through the ceiling. If it's out in the sun a lot, the caulking can dry out and you get leaks around your shower skylight, pipe vents, or ceiling air vents. Cleaning off the old caulking and applying fresh material is a fairly easy job. The professionals just make it look neater.
Jerry