The logical (not necessarily legal) response is : come here- no problem; register here- technically might be a problem, but unenforceable; resell here- technically might be a problem, but unenforceable; sell new at a dealership possibly a problem. The U.S. does not want to stop mega -yachts from visiting. They certainly don't want to stop trucks, ships and trains from bringing in goods. They don't even want to stop old American gas guzzling hoopties visiting from south of the border. All these things bring commerce. The laws are aimed at factories, power-plants and the like, then moving slowly up the chain. I don't think we'll see inspectors with carbon monoxide wands walking up the docks any time soon. This is an issue for manufacturers to deal with.
Our legislators think they have to pass legislation to earn their keep. If we enforced every law on the books that's about all we'd do.
