My 99 Bigfoot has a slight dip in that area and it hasn't caused a problem. Looking at the sealant around the other intrusions, they look like they need to be cleaned off and replaced. Also the tank vent doesn't have the vent caps on it. The vent cap helps prevent water between the camper and the vent. Bigfoot has a specific roof coat. It's not hard to do. I had a harder time getting the right stuff.
I would buy it if it was what I wanted. I love my Bigfoot and when it needs expert repair I take it back to Vernon, BC to a little shop that repairs them.
