I recently purchased a 2016 Jayco sport 8sd, and there are small ripples on all 4 corners, look more like a manufacturing problem than water damage? No sign of water damage inside or on they plywood around the corners. Anyone have input on what this is or how worried I need to be? I have some pictures if I can figure how to attach. Thanks for any answers!
Perhaps someone with an popup like yours will chime in.
My guidance would be that the wrinkle itself is not anything to be overly concerned with, and with that there is a concern for the cause of the wrinkle. If the cause is that there is water seeping in from the side and causing the underlying structure to deform then certainly that is a problem. I would suspect that if you do have water intrusion that it may not be all that bad at this time, but I would determine how others seal theirs and short of that I would suggest that running a bead of geocell or similar along the edges where the trim and TPO material meet would be a good thing to do.
Perhaps a 2" strip of eternabond tape along the sides, although using eternabond tape here may not provide for the same appearance that you prefer, it certainly is great for sealing seems like you have, geocell would probably look better but I suspect the eternabond would be a longer lasting option.