I just went through 3 tubes of self level to make sure this didn't happen to me.
I had some evidence of a leak at the front of the 5th wheel. Up on the roof I noticed the old self level had some cracking so I removed the old stuff. In doing so I learned something. I had always assumed that the rubber roof membrane went under the front seam where the front cap attaches to the roof. Nope. Not on my camper. The rubber roof just butts up against that seam. The only thing keeping it down is the self level/caulking.
2021 Chevy Silverado LTZ 3500 Diesel
2022 Montana Legacy 3931FB
Pull-Rite Super Glide 4500