California's definition of a trailer:
"A “trailer coach” is a vehicle, other than a motor vehicle, designed for human habitation or human occupancy for industrial, professional, or commercial purposes, for carrying property on its own structure,
and for being drawn by a motor vehicle. CVC §635."
(Bold Font added by me)
Once you put the Towbar on the front of a Motor Vehicle: it becomes a "Toad".
That Towbar is designed to make the vehicle capable of being towed; therefore it extends the definition of trailer to the vehicle it is attache to.
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