I found a grommeted hole under the rear seat (passenger side) that appears to provide direct access to the outside. I am a little confused considering the wading capability of the vehicle. This small grommet cannot be the only thing keeping water from entering into the cabin. I would like to know if i am missing a plug on the underside of the chassis. When i remove the grommet and shine a flash light (at the right angle) i can see the light under the vehicle. Can someone try this on their Grenadier and see if they get the same results?