Let's talk about a car, for example. Is a modified car still in the commercial class?
You can register a car in the 'commercial' class if all the seats behind the driver are removed. Instead of the seats you must install a permanent box or permanent rack to carry cargo.
Ah, I see. Will the DMV examine the vehicle and put it in the correct class then?
The DMV can not examine your vehicle to determine the correct registration class. You must determine the correct registration class for your vehicle.