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Copying a reply I made to someone else in this page cause it's relevant:

Commercial vehicles are (most of the time) required to have and display a DOT number. This is normally placed on the sides of the vehicle with "US DOT" above the numbers. These are usually seen on heavy/larger vehicles but there are instances where even a sedan might need one.

It's not the first time I've seen sovcits trying to use a DOT number on their car.... But ironically by doing so they're basically saying it IS a commercial vehicle. I don't pretend to understand the logic.

Although this fool put it on the license plate, which is not where that goes. Has to be on the sides although they really didn't have business with a DOT number at all so I guess that's the least of their worries.

Actually these numbers are able to be looked up on the DOT website and looking this one up I think I understand why they're doing it. (Also it gave me this dude's full address and phone.....)

They can mark themselves as a carrier of "Private property" and "Private Passenger (Non-business)" neither of which means what they think in this context but makes them feel like their kookery is official.