Yes, please look at your silicone caulking on your trailer right above the truck, especially when you are hooked to the truck.
If you see the caulking is loose or separating, you might have my same problem with the welds breaking on the frame underneath.
Mine has been repaired, a lengthy process, but I had no cracks in my fiberglass wall UNTIL I got the repairs done.
This is a problem that you can't diagnose until you see serious separation happening from the caulking on the trim from the fiberglass wall.
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