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So, googling that charger model, it does seem to take both 120/240 input, but I see a couple of different variations on the charger, some with plug adapters, some with out. e.g. this one will work with both as it comes with an adapter option:
https://www.amazon.com/Megear-100-240V-Portable-Electric-Charging/dp/B075GJK2S9/ref=rtpb_2?pd_rd_w=LFHe9&pf_rd_p=be844577-fee7-4bbc-8dda-083e56cc6f0d&pf_rd_r=NJ66KE8MQTD5M24PEN9D&pd_rd_r=f60ca298-a4bb-409a-bb7b-73885c5772e6&pd_rd_wg=iBANd&pd_rd_i=B075GJK2S9&psc=1

It looks like, if it has the NEMA6-20 plug, could just get a NEMA6-20 to 5-15 adapter for a little over 20 bucks and you should be good to go:
https://www.amazon.com/5-15P-6-20R-Heavy-Electric-Adapter/dp/B08CXKHVVP/ref=sr_1_5?dchild=1&keywords=nema+6-20+adapter&qid=1617288103&sr=8-5

Just be sure to look at the charger before buying it and make sure it's actually rated for 120/240 input. Oh and most home outlets are only rated at 120v/15A, so the most you can charge at is 12A on those. If you have a 20A rated circuit, you can charge at 16A (long duration use is limited to 80% of the max circuit amperage).

Having 240 is the way to go. We got lucky in that we had an old dryer outlet near by, so we now use that to charge our i3. We can only charge at 24A, since it's a 30A outlet, but it's fast enough for us (32A on a 40A outlet is max).

No, there aren't any snow tires for 20" rims. You don't really want staggered rims for the snows either (our Rex as the 5.5" wide rear rims and the 5" wide front). You can put snows on the 5.5" wide rims, but it's not ideal. There are some good deals on rims from other owners who sell them off, otherwise they're a bit expensive, with only one real aftermarket rim out there, the Rial. If you do get snows, look for the Continental Viking 7 tires, those are the ones to get right now. Snows for the i3 are made by Bridgestone, Nokian and Continental currently.

Interesting, or should I say frustrating, on the car values vs trade in values. There is definitely a supply/demand aspect to all of this as well.

Oh, and we've had the i3 off road a little bit. It doesn't have much clearance, but it sure is maneuverable :D