Way to paranoid. Inspect twice a year and reseal when necessary. Its really not that big of a deal, a newer trailer should be good for quite a few years, inspect the roof in the spring and again in the fall. If you find some sealer that's cracking or flaking off its time to remove the old stuff and lay down some new. In heavy snow climates the biggest thing to worry about is snow load and cleaning some snow off the TT roof if it gets to deep.
2015 Eclipse Iconic Toy Hauler made by Eclipse Manufacturing which is a pile of junk. If you want to know more just ask and I'll tell you about cracked frames, loose tin, walls falling off, bad holding tanks and very poor customer service.