I have a 5er that came with a single 12V RV battery. I am thinking of replacing it. What I don't know, given the same amperage, would I get better service from 2 12V batteries in parallel or 6 6 V b...
Yes Lithium or SiO2 with 200 amp rating is typically two batteries and is fine. I don't think these are on the radar. For what the Op is looking at I recommend 4+ batteries to properly drive 2000 watts.