I wanted to use two batterys so, i after thinking a bit about it and deciding i want it as clean as possible, this is what i did.
National Luna management kit..
Opened the "bottom" of the jeep as showned on the pics (kept the stable bar and works perfect);
Then i just secured the second bat and got the cables there.
In the back, i needed something to carrie all the stuff i enjoy having around. Boots, belts, jumper cable, rope, etc...
I decided to get the ARB (also) Kit for the JK.