Water droplets on outside of Class C overhang

Have you looked at the entire underside of the overcab mattress for signs of moisture exposure? The front edge and ends are difficult to inspect, but most likely to show signs of leaking.

Jim, "Mo' coffee!"

You could have it pressure tested. Cost about $150.

Dusty

Only time when not raining I've noticed that is early morning after a heavy dew.

Do you have a front window? I get water drops on mine from the front window. A little water from under the window trim usually drops water on the cabover part then onto windshield at first stop sign if it was raining within last week. But this only happens when we drive it, not sitting. And only till water that is trapped in the window trim is gone. No more than a couple soup spoon sizes at most. And my A/c can't drip to front of overhang because of the way the roof is held on by a trim piece. Water on mine would have to jump 1/4 or 1/2 inch trim. The way your is built maybe water could fall off front overhang. Should be easy to find out. Next time you see water look up there and see if coming from a/c. But my A/C sure has no problem leaking water to the awning side, which is maddening at times. I try to leave the left side just a bit higher than right side when leveling so the crazy a/c drains to left side of rv. If your really scarred about water damage make sure you get it inspected by someone you trust or should I say pay money to that claims to be a pro? Just did google search of "tell tell sign of water damage & rv" and got 2,300,000 hits. But also many links to how to inspect for water damage.