Why? Truck seamlessly and scalably move cargo for thousands of customers at once. Distributing that to hundreds of smaller trucks for tax efficiency would be worse for the env
A mileage tax is going to be a necessity with electrification in the future, and it doesn't make sense for all weight-classes to pay the same tax as they don't do equal damage to roads.
That's an understatement. Afaik damage to the road scales with weight to the _FOURTH_ power.