Residential Fridge Batteries - How many??

Ranger Reg wrote:
Just purchased a new 2017 MH with a residential fridge. Fridge is running off 1800 watt inverter and two six volt batteries. Will two batteries suffice or should I add a couple more?

Fridge will probably stay on all night with what you have, as long as you don't shut down until later in the evening and if it should go off later into the night, it will still hold, without the doors being opened. Come morning, it's start the engine or the generator.
Our new to us 07, originally came with 4 group 27 AGM 12v in parallel. Had 4 6v wet cells installed and a no no in an un-vented compartment (that's a dealership for you) I'm going back to the original configuration with it and whether, one might be preferred over the other or not.