Freak hit and run today !

I drove my 1993 Mazda B2600 4x4 to work today and parked out back . I drive the Zamboni for our ice rink and the facility is backed up against the freeway .
My coworker starts waiving at me while I am cutting the ice… she tells me my truck was hit by a runaway semi tire !
I just finished restoring this truck ! Urgh…. The semi never stopped ! I call the hwy patrol and they come out . They filed an accident report then went to look for the truck . Nothing so far .
A few hours later it occured to me that this is a FRONT wheel ! WTF ! How does a tractor lose a front wheel and not stop !

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