You don't say where you were located, but maybe you have a window leaking if you've had rain. Is your fresh water tank located in the rear? If so, you may have the elevated area in the left rear corner where the fresh water fill is located, and maybe that is a source of the wet spot.
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Bob & Becky
2012 3402RL
2012 Chevy 2500HD D/A CC 4WD
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