Your average techie/doctor/lawyer/manager who thinks he needs a 4Runner for his 2-kid household is not going to be dissuaded by hundreds of dollars here or their when their mortgage is thousands a month. You need a huge tax. That huge tax would be punitive on all sorts of "legitimate" activity.

If it was a politics thing and not a "everybody who looks into it with any depth decides it's dumb" thing then some state like MD, RI, CT, or MA would have taxed it already.

Furthermore, we're talking about "damage" (in sarcasm quotes because expected and normal wear isn't damage in any normal sense of the word) power equation here[1]. So basically everything that isn't a class 6/7/8 truck is inconsequential for a road that has any portion of its traffic made up by those vehicles. Since those trucks basically run the economy someone has to pay for it. There's really little political will to engage in an obvious exercise of "picking who to screw" like that vs an imperfect but fairly fair fuel tax.

[1] https://www.insidescience.org/news/how-much-damage-do-heavy-...