Here's the wire going thru the interior center console to the back seat. I figured I would put a nice quick disconnect switch here. I used the following wires:
13ft of 2 gauge
13ft of 10 and 8 gauge.
I had to get the 8 gauge from NAPAs secret stash in the back. If you can't find in the electrics aisle, just ask.
Here are the two main grounds I used.
One is in the trunk and the other is where the battery tray used to be. A little sandpaper and a couple self-tapping screws will put you in business.
The screw is right in the middle of the picture.
It holds the original batttery ground to the body.
Here's a couple more views.