(a) The registration fee for all convertible vehicles shall be ascertained upon the basis of the vehicle’s gross load weight. It shall be determined which is the greater, the gross load weight as a carrier of persons or the gross load weight as the carrier of property, and the greater gross load weight shall be the basis for calculating the required registration fees. The fee for all station wagons shall be the same as for vehicles used for pleasure as provided in § 2151 of this title.
(b) The gross load weight of buses used for carrying persons shall be ascertained by multiplying the maximum number of persons the vehicle is provided to carry by 150 pounds and adding the result thereby obtained to the weight of the vehicle as specified in the application.