in that reguard, "commercial" refers to the registration of a vehicle- nothing to do with windows. For example, when i bought my bus, ( in Ny) it was registered plain ole passenger. I owned a business, and insured it as part of that business, thus i registered it commercial. When i moved to Al, i was informed that it could be registered as an rv, which i did for cheapest insurance and registration. Nothing about the basic platform of the vehicle changed, BUT THE INTENDED USE DID. See what i mean? Also, in Ny, pickups under a certian GVW can be registered commercial or passenger, depending on thier intended use. I did, however have to pay extra on the NTS thruway because i was "overheight".... as in i took up more of thier airspace....
