It didn't happen this camping trip (until we stopped to empty the tanks) but it did happen last year where I noticed the water dripping out from between the black material that covers all the tanks. We were dry camping and my water pump turned on when no one had ran any water. I checked under the sink, shower, at the water heater and could not find any signs of water inside... which makes me think it's under the trailer somewhere. Now I didn't have the water pump on while driving yesterday so that doen't explain why there was water under the trailer this time.