Here is another thought: What if, in the future, someone designs an EV RV! Now there is no gas or propane; just a ton of Li-Ion batteries in the chassis (or whatever the new tech battery is called).
Now your only option is an inverter (and solar cells) to keep the thing running.
Sure that day is a long way off given that most EV's these days go less than 100 miles (mine can barely make 100 miles if I stretch it; of course Tesla's not withstanding).
Also keep in mind that there are now battery buses and battery garbage trucks.
Electric Garbage Trucks: Huge Energy Savings And They Won't Wake You Up In The Morning - Forbes
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