[rpmerf]

I have a washer tank on the passenger's side. Currently using it as a coolant overflow.
Not sure if it was factory or not. My truck did come with factory dual batteries. I don't have a drivers side tray, and the regulator was mounted to the firewall. When I got the truck, the second battery was in the bed. I found the original dual battery wiring (relay that hooks into IGN UNFUSED) in a box of stuff I removed with the bed battery.