NY state requires all vehicles on property to have plates. I doubt its the only one.

Its a small argument, but it does serve to show that the rules are different everywhere. I found that particular NY rule to be a problem personally. Im sure you could hide one on a big enough piece of property, but it wasnt unusal for cops to go around looking down driveways for unregistered cars

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I like rules being different everywhere. It is the purpose of federalism -- to allow states to make rules that fit their own needs. The needs of Vermont have some needs in common with Arizona but I doubt anybody would argue that all laws in AZ must be applied in VT. Or vice versa. To make laws universal is to oppress some for the benefit of others. We like it when it agrees with our own perceptions and tolerate when it seem close to what we believe. When it goes beyond some unknown point, the oppressed people build resentment. Resentment toward the national government is unhealthy to a free society.

So we have a relief valve of sorts -- we let states figure it out as much as possible. But sometimes in our rush to cure what we perceive to be a national ill we perpetrate a greater ill on people who may not agree with us.