For boats connecting to "shore" power, there are 120v and 240v (and 120/240) connectors, from 15 amps to 50. Good enough fo outdoor, wet weather use, but apparently EV owners are too stupid or weak to use them.
For some examples, see page 399 of the West Marine on-line catalog:
I guess we need special, expensive, one-vendor connectors because these were ... too unsafe and difficult to twist to use?
See SOC/GID-Meter and CAN-Do Info
2011 LEAF, 2014 Tesla S85
2018 & 2019 Tesla Model 3
Solar PV: 33 x 225W -> 7 kW max AC
Craigslist: Xm5000Li Electric Motorcycle