An old thread, but I found a new (I think) video worth checking out (see below).
In this already damp weather, I am at the point I can't drive mine safely now, the condensation on the screen is un-shiftable.
Anyhoo, I checked the rear tool box cubby hole and found it has around an inch of pooled water on the left hand side. No matter how much I dry it out with towels and a heater, it fills back up in wet weather.
But my Tailgate door seals look good, so I was puzzled.
But check this out, are we checking this for our rear leaks?