Adding extra batteries - where do I put them?

we have two group 31 Duracell agm that do us just fine with an eu 3000 is Honda generator. use the generator in the morning a bit and afternoon a bit with a 200 watt solar panel for keeping things up. In the normal days without running generator, we get a couple days without an issue with just batteries, add plenty more with generator. but this is us, we don't have residential fridge and all the stuff that burns up power. And we are conservative. My thought if in your shoes is to pick up a small 2000 watt generator that will keep things charged, add one later if you want to parallel them for a/c.