Where is all the extra electric going to come from to fill the EV demand? Many places struggle to provide enough electric now.
what do you mean by 'where' is all the electricity going to come from? it's coming 'from' the same place it's always come from: power generating plants. If your question is really a concern of 'if' the utility grid can 'handle' the supposed 'additional' power EV owners use to fuel their vehicles, well, that's not a concern, either.
Here's why: for every gallon of 'gas', it takes a LOT of electricity power to produce it. When you don't need gas power any more, you are replacing the need to provide power to produce it, to then provide power to charge your truck. There is little difference in the offset.
Also, as for the 'grid' being able to handle the supposed 'extra' power needed by EVs, think of it this way. Electric providers give HUGE discounts for nightime electrical usage - meaning that their greatest 'demand' on the grid is during the DAY, not during the overnight when we EV owners are mostly charging. If the grid can already handle the 'daytime' industrial and manufacturing and retail usage of power, it can certainly already handle the growing EV charging requirements during the very LOW usage overnight hours. There is no worry about the grid.
and, I think the notion of the statement that 'many places struggle to provide...' is fake news. You are buying into the big C's constant liberal news outlets commenting on how the 'world is coming to an end', and 'global warming, by Humans, is destroying the earth', supposed 'truths', that are not.
Like anything, power companies grow over time to meet demand.