Make sure your roof drains aren't kinked/plugged or disconnected and then park it in the sun with some damp rid inside.

If the humidity levels are really low there you can run fans with the windows down overnight till dried out.

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"When the Team Chief said.... You're trapped in a hole with nothing but a goat and a slinky, what do you do? Stubby said, I'm not sure but it won't end well for the goat...." ~(Overheard) Last day, Phase 3, Q Course