So an ICE powered van, with ICE powered generator ( or was that a 'universal voltage battery / inverter setup) comes to rescue of stranded BEV, priceless.
I would expect an electric van to turn up and erect a solar panel or wind turbine or if close to a local stream a water turbine to charge up the battery. BEV drivers could always carry a can of electrons in the boot, or maybe a spare battery to give them some extra range. Normally if an ICE car runs out of fuel through a total numpty driving it, the normal remedy is to cadge a lift to a local service station, buy a plastic can and top fuel tank up and drive to local station to fill up properly, ( unless it is a Diesel, do you still need to get the AA to come and refill the system if you run out of fuel ? )
https://www.spectator.co.uk/2017/08/electric-cars-wont-get-us-very-far-because-they-cant/few years old but still relevant.
Truth is that if government took their big chunk of tax off the cost of petrol it would hardly make economic sense to own a BEV, they are normally double the cost to buy of an ICE car, and without subsidy hardly any would have been sold.
The green bit does not even ring true any more, particularly now we know that wind farms and solar need pretty much 100% backup capacity from other .'non-green' ( conventional) forms of generation if we are to maintain a reliable electricity supply).