Re: WK2 dual batteries
How about in the hollow spot around one of the wheel well liners? You may have to fab a tray and cut an access panel in the liner, but there should be room. That's where they put the battery in Nascar race cars.
Sean in PA
2011 Jeep Grand Cherokee Overland
5.7 Liter Hemi V-8
Adaptive Cruise & Blind Spot Monitoring