Bbhind the seat under the side carpet is a "channel" of metal that sticks out, I used a 1/2"x1/4" self tapper and put it there. Be sure to use a ring terminal. DOing ti here will allow you to run the ground under th ecarpet and completly out of view.
In this same channel, there are already several pre drilled holes, which would allow you to just use a machine bolt and nut instead if you don't want to go through the trouble of drilling a screw in there.
Locktight will be a good buddy, too and defently do a bit of sanding to guarantee a perfect surface for grounding.
Rob, I used to have mine grounded there, but I cought a bag of grocerys on it once, and my hand another time, and my head once....
