I have 7 vehicles, so I direct wire all my vehicles to use an OPTIMA battery maintainer when I am not driving them. On my S550, Dark Horse and Corvette they are at the base of the windshield, on my other vehicles, it is in the grill area. you can see the plug in the top picture and the harness...
Great write up! My Dark Horse has a NACA duct to send air to the cooler, wonder if anyone will offer a rear defuser with a duct to feed cold air to the cooler.