One of the big issues on EV's is paying taxes to maintain and build roads. Funds for this come from fuel taxes, which EV's don't pay in many instances. EV's are also much heavier giving roads more wear and tear than normal cars. I know some of our legislators are considering how to best tax EV's for highway building and maintainance. Certainly, a steep annual fee for an EV with an instate registration is a good way to go but what about transient EV's from other states that pass through? With regular cars, they will likely be buying fuel in the state they pass through so they contribute, but EV's do not do that and so get a free ride on the state's highways.
One solution that makes sense is to do what some European countries have done, and require a tax sticker on the windshield to drive in that country. I have stopped at borders in my rental car to buy such stickers before entering. EV drivers could do that every time they cross a state border in order to help pay for that state's roads. They could also enter their license plate number in a computer system at the time they buy the sticker, so that could be entered into a data base for the highway patrol. That way, if a trooper is following an EV, he can bring up whether that car has a valid sticker in the state without having to pull him over to check.
You're in the 'Dark Ages' as far as apportionment is concerned. Pre-1992, interstate trucking had what we called 'Bingo Plates' that were affixed to the front bumpers of each tractor. Trucking companies had well staffed- and paid- personnel to tally up how many miles each truck pulled a loaded trailer across the various states. Then they had to send funds to some states, and bills for additional road-use-taxes levied, that would be divided up among the states.
That all ended with the 'Surface Transportation Act of 1991'. Now, there is a large percentage of road-use tax that goes to the Federal Gov't, and some states charge a smaller amount to cover state highways and general road construction and maintenance.
What you're calling for turns the calendar back over 30 years. Owners of EVs pay a premium on their annual registration for road upkeep, and excise taxes paid on tires is higher on sizes used by heavier vehicles.
The loser is the sticker-printers, who lose business and contribute zilch to solving the issue.
Carolinian, when you choose an issue to push back several decades, please research the related history.
Jim