Adding extra batteries - where do I put them?

Revisiting this - So we never ended up boon docking and I am glad we opted for a site with electric. It got much colder than predicted and our furnace ran quite a bit to keep things comfortable. Our FW, while better insulated than previous MH's, with high ceilings, massive slides, much more sq ft, takes a lot more to heat than I am used to. That's fine but it was educational. My batts would have been dead on night one. Add to that, that DW has a point in that we bought an RV for all the comforts of home and not shivering in blankets, putting things in a cooler, etc just to save amp hours. No offense at all to those that favor that sort of thing. We started out tent camping decades ago so I get it.

So I mentioned I have a 6500 home genny to use in power outages that frankly we haven't used in years and when we did it was only to keep the fridge going. I think it has like 5 hours on it. SO - My plan is to sell that one since it's not practical to lug camping, and it's LOUD.

I will replace it with one that we can take with us. My requirements:
Run one AC at a minimum and quiet. I know Hondas fit the bill, but are there cheaper options that are small and quiet enough to handle this given that we would use it so sparingly?



Thanks all.