Could probably get pretty close by making it a % of the current Blue Book value of the car. No offsite data needed.
Would probably need to leverage something like the interstate drivers license compact to synchronize that data across all states, and there'd need to be solutions for edge cases e.g for people who rent cars and homes rather than own them.
You think Montana is (or should) expose a complete picture of a citizen’s financial situation so that New York City can issue tickets a bit more fairly in the event that citizen visits NYC?
Won’t happen.
The point is not to punish every single violator exactly fairly, it’s to more effectively deter violations among everyone
And most jurisdictions have laws promoting snitching on your neighbor for tax evasion anyway. You don't even really need the compact; just pour some of the fine revenue into enforcing property tax evasion. That simplifies it to just enforcing the fine against a percentage of registered wealth wherever you live, and the reciprocity challenge can be deferred to later. But then you're likely to score wherever the driver has their multitude of cars garaged.
Billionaires will still escape, but people definitively in the upper class will be more effectively deterred.
The goal is to tag the people for whom a few hundred dollars means nothing, and you're not going to get there with a percentage fine unless you're factoring in all their assets registered to the state and incentivizing the state to enforce tax evasion statutes. CHP, for instance, has at most two officers enforcing Montana plate dodging in SoCal.
That's the problem with "simple" statutes; they're easy to dodge and thus hurt the people who can't.
Why are you choosing to die on this hill lol, I'm trying to help your point.
https://www.yahoo.com/now/much-middle-class-6-us-130110380.h...
How many SF, NYC, DC folk do you know pulling 150-250 a year driving cars that are 50% of their income? It's frequent; anecdata, I can think of a dozen.
And that's my point.