Following up on your boat analogy, it can take 3-6 months of sitting out of the water for a boat that has water intrusion into it's hull laminate to dry out enough to begin repairing it.
And the balsa core will never dry. It needs to be opened up, removed and replaced.
So for your RV, stop the water coming in then it will slowly dry. I don't think RV builders use balsa or any coring in their laminates.
Yes Thor and maybe most RV builders are like the Taiwan Tub builders from the 60/70s. Their boats leaked, the fiberglass core got water inside and then they rotted.
David
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