The caulking used for anything touching the roof is Dicor, self-leveling.
For the walls and other seams it's Royal Seal Silaprene 1000. You can go to most RV dealerships, they sell the brand Proflex which is the equal of Silaprene.
It's been debated and there are several opinions but I wouldn't suggest you use any silicone on the camper - Crossroads only uses silicone for the interior in the bath and kitchen.
2013 Jayco Eagle 334RBTS
Crossroads Forum Lurker