I have a Blue Apple 75AH (thumper) battery pack sitting in the back of the Jeep connected to a three way battery isolator. This battery provides power for the 45lt Waeco fridge, kids gadgets and the Toughbook (laptop) up front. When the fridge is in, it mounts on it's side so I can use the right hand rear seat.
I'm going to fit tie downs to the back of the seat as they both move around.