Looked at a Viking for sale today and noticed that the roof seam seems kind of bare. It is the 2 sheet metal halves of the roof that meet in the middle. Only thing covering that seam is some old, half-missing caulk/tape stuff. My Jayco has a metal channel that covers the seam, a vinyl strip that goes in the channel, and then caulk the sides of the channel. Seller said that's how it's supposed to be, from the factory. I did not see any screw holes along the seam, which would indicate a missing piece. Is this how it's supposed to be?