Issue - caulk at interior roofline

Photomom

A gap has appeared in the caulk at the passenger side roof line, see photo. I noted this last summer, seems a bit wider now. Of course it is 40 degrees out there. I can recaulk the area easily enough, but would like to make sure this doesnt indicate some underlying issue before I do that. The rest of the trailer is beautifully caulked with no gaps. 

ScottG

That looks like garden-variety painter's caulk to me--I'd wager it's just cosmetic to fill up unsightly gaps in finish materials.

Given that this is a lightweight little house on wheels that gets bumped all over creation, I'm impressed all the seams don't look like that!  :-)