[ghaff]

A quick search suggests that a title can be transferred to an LLC. (e.g. https://smallbusiness.chron.com/transfer-private-vehicle-llc...). IANAL.

[PeanutNore]

A vehicle title and a vehicle registration are separate things, though. It's entirely imaginable that an LLC may be able to own a vehicle title while still not being able to register that vehicle.

[dublinben]

Vehicle registration is a common service offered by registered agent companies in the states mentioned in the article.

An out-of-state license plate could attract unwanted attention though, which may be why Lopp chose not to employ this technique.