confused about my RV house batteries

There is a upholstered chair inside the door pass side. Behind that chair I mounted two 6v gc batts in a plastic box end to end. Two big cables to two more 6v gc batts under the stairs. I got a vent kit off the internet. Drilled a two inch hole in the wall for vent. Four is all you need. I have 550w of solar and a 2000w psw
inverter because I plan on installing a residential fridge when
my dometic dies.