I have found that my T100 has some holes on the bottom of the seam under the door sill. These let water out that accumulate from any water entering the back cab vent by the bed. I can git a drinking straw and clear out those holes and water will stream out like a puppy taking a piss. Also...when I'm driving I can hear water sloshing around in there.
I was wondering if yer Taco might have the same setup. Could yer holes be blocked up and allowing water to accumulate in there? Just a thought...
