Yeah, I hadn't factored in the twisting of the trailer as it moves. Makes sense.
Now I'm stressing over the spray I put on there. I first tried rustoleum leak seal, spraying it on the cracks and a few patches that were maybe two square inches of exposed EDPM. But that made the thin layer on top of the EDPM curl and bubble like it does when it's wet so I tried the undercoating spray instead.. So most of the EDPM at least has a layer of rustoleum leak stop between it and the undercoating. The undercoating is petroleum based but it doesn't seem as intense as something like gasoline. I know it's not ideal but do you think it actually needs to be replaced? The trailer is a '96 so it's older.
Thanks for the help!
Bob