I've been seasonal camping for about 6 or 7 years. I've seen several neighbors with these cracks. They all came back with different campers the next year. None talked a lot about it, so I suspect it was money lost for them.
Basically, your frame is shifting. The gelcoat is adhered to the frame with a strong glue like liquid nails. The part glued to the frame is separating from the rest.
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2019 Salem Grand Villa 42DL
Seasonal camping on Lake Guntersville
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