10 kw charger will need 50 amps. That's future proofed for Tesla (and if you decide to look at the Mercedes....)
I charge my Smart on 110. Very slow but my charger maxes at 3.3, so I've not been in a hurry to update. There are a fair number of charge points around, so if I need faster charging I can go to one of them.
30-40 miles to me is like saying 30 to 1000 miles in winter. 30 is no problem, 40 at 5f temperatures is very dangerous. I think the same is true for my friends with Leaf's.
The Mercedes seems to be selling terribly. It is imo hands down the best compliance car, and can sometimes be acquired for under $300 a month lease, very little down, because of the sales incompetence. Range is huge and charging is at 50 amps, which means you'll get home with fair range and after an hour, be nearly full if you want to go out again.
Because Chevy and Nissan have also done a terrible job with their sales force and have done nothing to create a secondary market for used cars, the cars off lease have poor demand and high supply. These cars are a good opportunity for EV enthusiasts as they are $35k cars with usually under 25k miles available for under $12k. Nissan is offering leaseholders a $7000 bonus for buying out their leases in an attempt to manage this.
On the flip side is value in 2-3 years is uncertain. If you pay $12 and its worth $3, you could have been driving the Mercedes.