Sal the tray has two legs on the one long side. The side with out the legs sits on the back tray of the tub and the legs bolt down to the floor of the tub. I brought mine as far to the passenger side that I could allowing about an inch to remove the battery holddown when neccassary. Kris cuts off the leg closest to the tunnel but I left mine on. Cables run right next to the outside of the leg closest to the passenger door. The ground underneth the car mounts to plate on the frame right there. If you need a picture email me and I'll send one when I get home.
marmoramustang@comcast.net