Self leveling caulking is mostly used on trailers with membrane roofs to cover seams and screws where water can pool. As others have said, I would use a good exterior silicone preferably with a mildewcide.
Water always runs downhill. If you have leaks on two or more different points on the trailer investigate seams on the high points first and don't ignore the areas around vents and the air conditioner. We also had a leak once at our TV antenna.
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