So I've been looking at options and came up with this:
It is possible to be able to hook and unhook two or more batteries to a Leaf:
I'm seeing wrecked Leafs for less than $1,000 total (except transportation), with no apparent battery damage:
https://erepairables.com/salvage-car...on/nissan/leaf
There are also 600V 350A connectors:
350A Grey Connector Power Pole Style Compatible Power Plug Battery DC Connector | eBay
Ah! And don't forget the extra charger:
Brusa 3.3kW Charger - NLG513-U1-01A - Water Cooled - Includes cables | eBay
So! If I got a whole battery or two from a wrecked Leaf or two and stuck them on a trailer and connected them to the car with some sort of huge switch, I could have an all electric range extending trailer.
It probably wouldn't double (or triple) the range. But hey! it would probably be enough to get to the next town with a charging station!