Cannot find source of roof leak on 2004 national Sea Breeze

What kind of roof do you have on your coach. Is it rubber, fiberglass or what? If it is fiberglass it could be where the one piece roof top meets the sidewall. You might have cracks on the caulking. The same where the front and rear caps meet the top cover. Best thing to do and that way you do not have to worry about leaks ever again is to buy a couple of rolls of Eternabond tape four inches wide and just lay it over the seams on a warm day. But water could also be coming in from a bad seal on your clearance lights, an antenna seal, skylight caulking, TV antenna's.

Now if you have rubber? Not sure!