I'd be surprised if most other states don't have similar vehicle laws.
1) Garaging a vehicle, for x days or more.
2) Driving a vehicle, for x days or more.
Have you looked into what the specifics are, and how they are triggered?
Poking some holes at this:
- Are you on the hook to register vehicles you don't own for actions (1) or (2)?
Consider two examples:
(a) you rent a vehicle,
(b) you drive or choose to house a friends' vehicle.
From what you've stated, logically, anytime you rent a vehicle or operate or house a friends', you now are asked to register it.
Do you think this is accurate? And if so, do you think it would hold in court of law?
(a) you rent a vehicle,
(b) you drive or choose to house a friends' vehicle.
in both cases, the vehicle would already be registered in the state (by the rental company or by the friend).
it is not clear to me why you think the vehicles would need to be re-registered.
under no circumstance are you (the customer) going to be required to (or even able to) register the car you are renting.
i would not take car registration advice from a person asking about registering someone else's car at the dmv.
If you're worried, seek legal council and pay your use tax.
Consider also this Montana-route may require being brave because when you make a stand for something like privacy, which is under attack, you too may be attacked even if you are in the right legally.