Elcid - Check caulking yearly, over time it shrinks. I need to do that on my 2015 as well. Dicor is preferred for the roofs. Word of caution, they do have a 1 year shelf life and do not state date on individual tubes but they do on the cases they come in. Either ask to see the case box they came in or buy from Dicor direct. My Father in law found this tidbit out last summer doing his truck trailer.