We all know to check all the caulking joints on the roof, at least once a year. I always look closely when washing the roof.
Well I had a silent killer. No signs of leakage inside. The main joints for my rear roof entry ladder had a couple of cracks in them and were allowing the wood under the roof to get wet over time. The last time I went up on the roof I noticed the roof trying to lift a little when I would pull up on the ladder to get on the roof. I did some investigating and discovered the cracks in the caulking around the ladder top mounts. When I felt around the top roof mounts they were spongy. The mounts on the back of the motorhome were rock solid, so access was not a problem, but I didn't like the roof trying to lift up when pulling on the very top mounts. I went in the closet and looked for water damage and there was no sign of water leaks or damage. I just didn't know it was happening. It had to be leaking a long time to deteriorate the wood under the rubber. I fixed the caulking about 6 months ago, but I was not satisfied with the weak roof under the rubber.
Here's the area I am talking about.