From an article about sovcits in Car and Driver magazine:

"The website FreedomFromGovernment.org offers a sovereign-friendly explanation of the asserted right to travel that runs some 30,000 words long, including citations. Multiple attempts to contact Trent Goodbaudy, a writer who apparently runs the site, were unsuccessful. But the online store linked to the site sells a set of replacement license-plate tags proclaiming that the vehicle is private, traveling without commercial purpose, and not subject to insurance or licensing requirements. They cost C/D$39.95. No one in the office has volunteered to mount them to their vehicle."

So basically it's a crazy sovcit idea. It's honestly very hard to tell where some of their ideas come from because they're such a loosely associated group, and honestly I've discovered that if I give them some bogus advice repeatedly (I tell them they must use a certain kind of stamp) they believe it and it begins popping up in posts of their own accord. They truly are a game of telephone.