Outer Limits 4x4 Board

I'm after some information on the twin battery set up the new D22 Thai built.
As far as what i have worked out, the system fitted to my str is a twin battery 12volt system & the alternator charges the batteries together.
I want to fit a larger CCA battery to the driver's side and fit a deep cycle to the passenger side with a solenoid between, to run my Anderson plug from.
Dose anyone know how big the Starting battery needs to be for or climate ? CCA rating?

Or does anyone know of another way to set this up in my D22?

There is no tray available for the twin starting battery model D22 mate as far as I know, this is from both Piranha and TJM. Your going to have to run a 3rd battery in your tray if you wish to run a dual battery system, as you will need both batteries to start the truck. Dont isolate the two batteries, you will need a third if you wish to run a fridge or any other accessory for any extended period of time.