window caulk around rubber window casings

[Home away from home]

just wondering what window caulk you guys use that is black or a brown to seal the rubber that that holds the window glass/frame and is part of the rubber gasket for the window rough opening in the trailer wall. as mine is a 2013 and the caulk is starting to crack and breakaway and is this a fairly easy job to do all the way around the trailer?

2013 3100 rl Montana ( sorry almost forgot to list what it is)