Dicor comes in self-leveling and non-sag versions. It works great, and as cwit said it's a easy clean with mineral spirits. The other alternative is Proflex which is longer lasting, more flexible, but is a tad harder to work with.
Around openings and trim use Frog tape or painters blue tape to mask the area and make a stright line and even caulking line.
Crossroads recommends NOT to use silicone on the openings (although some people have had luck with it in certian climates).
2013 Jayco Eagle 334RBTS
Crossroads Forum Lurker