@roosterm I am a little confused on your vehicle setup. With your dual battery setup do you have the aux battery in the car or only wiring back to the anderson plug from the redarc and the aux battery is in the trailer or van.
As you are getting an Outback model you have the solar panel setup. This should be enough to keep your battery charged on the move. The anderson plug on your towbar should be all you need to power your fridge whilst driving. If you do have an aux battery in your car then fit a fridge switch if you don't have the aux battery in your car then the redarc isolator is enough that your cranking battery won't go flat when stopped for lunch etc.
You will still require the 12 pin socket on your car for the ESC via another cable run from the cranking battery unless you get tricky and run the ESC through another anderson plug. You don't want to have your fridge and ESC suppplied from the same anderson plug on the draw bar as you want the option to disconnect the ESC when off road(ish)
As you are getting an Outback model you have the solar panel setup. This should be enough to keep your battery charged on the move. The anderson plug on your towbar should be all you need to power your fridge whilst driving. If you do have an aux battery in your car then fit a fridge switch if you don't have the aux battery in your car then the redarc isolator is enough that your cranking battery won't go flat when stopped for lunch etc.
You will still require the 12 pin socket on your car for the ESC via another cable run from the cranking battery unless you get tricky and run the ESC through another anderson plug. You don't want to have your fridge and ESC suppplied from the same anderson plug on the draw bar as you want the option to disconnect the ESC when off road(ish)