Discovered wet carpet. When the vehicle is sitting in the driveway during a rain shower (with the rear end slightly below the front), water seeps out onto the floor in the right rear. After removing the carpet, I found that the water was seeping out onto the right rear floor from inside the frame that holds the rear door latch keeper. The rear door seems to be making a good seal all the way around. I took off the rear bumper to inspect the area. Doesn't look like the water is entering from the rear just above the floor level. I'm left to conclude that the water is coming in up higher and running down the back right post and then seeping out onto the floor.

Roof Rack mount area?
Rear Side window?
Moon Roof leaking all the way to the back?
Body seam leak?

Any ideas?

Thanks.