Will be buying a used 2003 International 7500 Class-8 with a single axle and an additional pusher axle. The truck is rated at 33,000GVW, but I am unshure as to what I will have to tag it for when I go to Lansing, MI to get the IRP Tags. The pusher has dual tires on it if that makes any difference at all. I was told by someone that I should tag it at 45,000 with the pusher because it is technically considered to be a tandem. Do I tag it at 33,000 or do I tag it at 45,000? The difference is going to mean a much higher price for the IRP Tags. Or is there a way of telling what the trucks GVW is by the type pusher axle that is mounted on the truck? Need some help here.