The problem with silicone is that if a seal goes bad nothing will stick to it again, not even more silicone over it. It will lift off after it is cures. There is a cleaner out there but at this moment I don't know what it is to clean old silicone off so that the surface will accept another bead of sealant.
The ProFlex that is clear LOOKS like silicone when cured but it is not silicone. You are going to have a couple of different tubes of sealant around, one for the roof seams (EDPM,TPO compatible) and one for side pannels, non sagging for verticle seams. Your RV parts dealer can direct you to the proper stuff if you ask them.