The following words and phrases when used in this chapter and in Chapter 96 (relating to motor carriers road tax) shall have the meanings given to them in this section unless the context clearly indicates otherwise:
"IFTA." The International Fuel Tax Agreement, including any amendments.
"License." A valid unexpired and unrevoked license issued pursuant to the International Fuel Tax Agreement by any base jurisdiction thereof to the motor carrier.
"Qualified motor vehicle." A motor vehicle, other than a recreational vehicle, which is used, designed or maintained for transportation of persons or property and:
If there is no registered gross weight, then the gross vehicle weight rating (GVWR) or gross combination weight rating (GCWR) of the motor vehicle shall be used.
75 Pa.C.S. § 2101.1