What if the truck does not have truck plates?

This question is dependent on these considerations:

Where is the truck.

Who owns the truck

What is the truck used for

What kind of truck is it.

Where I live the largest truck can be registered as a personal vehical with car plates as long as it never ever does comercial hauling. It is still subject to inspection as a comercial heavy truck to insure it is safe but has the same registration as my Smart Car.

This will be completly difrent in other places.