Pointless… too big, too heavy, too expensive.
A 250 – 300 mile range is all that’s needed for any car but a vastly improved reliable charging network is essential so that a quick top up can be gained when you stop for a toilet break or a rest…
Now I know a lot of folk will say their car does 600+ miles on a tank but your bladder wont last 600+ miles, also it’s dangerous to drive for that long without a break