I have read the numerous dual battery threads, so I think that I am up to speed on the wiring, etc. One thing not really covered - Anyone made their own Tray? Thinking of moving the coolant overflow back or somewhere. I don't need the stock jack and stuff b/c it won't work with the 35's anyway. I am going to fab a tray to hold dual batteries on the passenger side where the current battery is. Has anyone done this? Any drawabacks? Any pics or suggestions?