Water leak

Brandy_2011

When it rains heavily, we find the passenger cargo area is soaked. We first noticed when we took out the spare tire and there was several inches of water. We have been trying to find where the leak is and have been unsuccessful. I washed the car and focused on the roof channel and lift-gate and all was well. So it is happening in a heavy, windy storm. Have visually checked the rubber gaskets and all seems ok. I have seen on this
post that luggage racks could be a problem....checked them too...seems ok...any ideas?