My friend in CA sent me his alert from last summer informing residents to either (1) charge your EV or (2) use your AC, but don't do both at the same time.
Probably charging 2 EV's at the same time would also be a bad idea.

And I agree with the article. Here in Vegas the heat of the summer is not ideal for EV's. And running the AC drains the battery fast, like driving at highway speed. And I got a quote last week from Nissan to replace the measly 24KW battery in my Nissan Leaf for a bit over $16,000. And it takes 2 to 3 months to get a battery.