I saw a dry van semi trailer with Maine tags yesterday, and I'm in Colorado.
Some trucking companies open a minimal office in Wyoming to quit paying Colorado's exorbitant license plate fees by registering their vehicles there.
As far as I know, we're the only state that penalizes people for buying new vehicles with ridiculous license plate fees. A $50k vehicle will easily cost about a $1,000 or more per year to register and the slow decrease in license fees can take easily 10-years or more before they bottom out to a flat rate.
Colorado bases it's fees on year of manufacture, manufacturer's cost (~2%), vehicle type, and weight.
We are getting more like Taxachussetts and Mexifornia every year.