MK, its truck camper ESP.....Thats funny you should mention that. This past week on our fishing trip in the catskill forest preserve my cooler drain was also open and it leaked inside my utility trailer. My first thought was was "oh no, a rain leak" until i found the ice cooler drain had opened. (whew,what a relief)
'silversand' ,i agree with you, when customers come into the rv shop for a non water leak issue , it's not till things get taken apart that water leaks and stains are visible. No brand of any rv is immune and the customers had no idea they had a leak.