Very Satisfied With River 2 Pro! Planning Upgrade, Recommendations?

Greetings!

About 1.5 years ago I purchased a used River 2 Pro directly from the Ecoflow eBay store at a hefty discount. I am so happy with it. I have it in my motorhome which I live in with 2 120 watt solar panels in series, a small Fartman...I mean Firman generator, and two high capacity medical 12v lithium ion phosphate batteries I charge and use if I'm out of fuel and it's cloudy. I love it so much that I want to expand my setup with at least 4 more solar panels like the ones I have, AND an Ecoflow power station that comes with two addon batteries (If it comes with only one addon battery that's okay). Anyway, I was looking at the Delta 3 with extra battery used/refurbished for about $400. Would anyone recommend a different system? The plan is to use the generator only to charge all the batteries once a day at most then shut it off to save on fuel. I also need the Air conditioner at about 5,000 btu to run on energy saving cool for 8-10 hours a day in the summer, and a 10,000 btu heater in the winter for a couple, 3 hours a day. Anyone have any input? Please and thank you!!!