What I was looking for was the ability to use two types of fuel depending on whats cheaper. For the record small
propane bottles can be refilled from 20 lb. tanks with an adapter thats availiable at Harbor Freight. A Propane powered
generator is on the horizon for me as well, mainly from the fact of poor storability of gasoline now days. I figure on doing a expendable lawn mower first before converting my expensive generator and having it not working out.
I remember in one of the vids a guy put the empty small bottles in the freezer before filling from the BBQ tank. I guess this facilitated the transfer? In either case it knocked the cost of a small bottle down.
I agree on having alternative fuel sources. When we had Superstorm Sandy, getting gas was either hard, or impossible, at times. Eventually they went to odd/even license plate numbers to ease the lines. Lots of gennies went thirsty. It was a mess. No electric, but we had propane lights and cooking, so it did help. I was loaning out camp stoves to friends/family.