We have the same year and model granite ridge that you have. On a summer trip to Iowa a few years back we had a similar issue. Standing in the coach with water dripping on your head definitely got our attention. A mobile repairman came out and determined because the a/c was working overtime due to the extreme weather, the pan which holds the condensation couldn't handle it. He went up on top, drilled a hole in the side of the pan and suggested, if necessary, we park a little off camber to allow the condensation to be released through the hole. It worked and the only time we have had any similar issues is when camped in extreme humidity for a long period of time. And, yes, we park a little lower on the one side just is case. Good luck.