I have a small crack very similar on my TC in signature. I caulked it and haven't thought about sense. Until now! I think a good jolt on the road here or there can make things flex a little now and then. My camper overall is in very good shape and never had any water damage. It was kept inside most of its life. I just took a 3K trip and did not notice any new problems when we got home. If it goes another 16 years with just another crack that big. I will be more than happy! Now if it was brand new that would be a different case.
