Welcome to the forum and irv2.
Congratulations on your Newmar many safe miles for you.
Here is a link to
12v battery systems and
12v wiring system in your Newmar.
In my signature there are three links that have other info related to your Newmar.
I had two 6v wet cells when I purchased the coach after four years of dealing with the wet I removed them and purchased at Sam's two 12v AGM's and do not regret it.
We have been able to dry camp in the dead of winter staying in Cracker Barrel lots on way to FL. and back.
Most residential refrigerators put in by Newmar have a dedicated inverter and a battery bank just for the fridge separate from the house battery system.
I'll let others with CS coach give you a answer mean while enjoy the forum.