The US government could overturn the "pickup war" instantly - just make vehicles under a certain (small) size entirely tax-free in various ways.

The market would adapt quite quickly.

Or states can adopt the minor and simple policies of California, where incrementally higher registration fees by weight, commercial registration for all pickups, and fuel taxes only slightly higher than other states and nowhere near as high as other developed nations have led to a private vehicle fleet with no trucks among the top-selling vehicles.

As 12 states have done:

https://mde.maryland.gov/programs/air/mobilesources/pages/st...

No surprises, it's the "states you'd actually want to live in" overrepresented as per usual.

That's not even one of the measures that I mentioned, but yes!