Is this a problem?
We have a 2021 Highland Ridge - Open Range stick and tin (conventional) trailer. It has a 3/8” walkable roof deck, although ours did not come with a ladder. I noticed the other day from my stepladde...
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clearly looks like the joint between OSB boards, possibly a bead of adhesive/sealant between the boards to make sure they stick together. On top of that, then, lies the membrane, and perhaps a wrinkle in that. This is just guess work, of course, since I have no experience with that make/model roof.
