So...question...and I realize that pictures speak a thousand works and I haven't a single one for this...but...

My tailgate isn't insulated very well from water, and I mean at all. I went through a fairly large puddle, thought the water was coming in through my chopped up wheel wells, only to find out that it's mostly coming in through the gap between the tailgate and the floor.

Anyone with any interesting and novel ideas on how to make this a little better in not ruining my back seats and rusting out the body??