(1) Any person, owner or operator who has paid the annual privilege license within one (1) license tax classification or specific gross weight bracket and shall desire to operate such vehicle within another license tax classification or an increased gross weight bracket for the bona fide and actual seasonal or temporary transportation or hauling of horticultural, agricultural, dairy products or livestock, and products of the forest, but not including the manufactured products thereof, may do so by obtaining a temporary permit therefor and paying an additional amount, which shall be computed and ascertained by the ratio which the time said vehicle is to be operated in the new classification or gross weight bracket bears to the total annual privilege tax within the new classification or gross weight bracket, plus an additional ten percent (10%) thereof, after having given credit thereon for the proportionate amount of the annual license tax already paid; provided, however, that when such person obtains a temporary permit in a lower classification, but of a greater gross weight than the licensed gross weight of such vehicle, then such person shall be entitled to credit only for an amount equal to the proportionate amount of the tax which would have been paid on such vehicle for its licensed gross weight in the tax classification in which such vehicle is to be operated under the temporary permit. No permit shall be issued hereunder for a period of time less than one (1) month, and no permit shall be issued hereunder for less than the sum of ten dollars ($10.00).

(2) Such seasonal or temporary permits shall be issued by the commission or its agents. The permit shall be issued on forms to be prescribed by the commission, and such permit shall authorize such person, owner or operator to operate said motor vehicle in the classification allowed for the period of time therein prescribed; provided, such person, owner or operator shall comply with all other requirements of law respecting said operation.

(3) At any time when the United States is engaged in a war, the Governor, the Attorney General and the Commissioner of Revenue shall have the power to provide and promulgate rules and regulations under such terms and conditions, as they may deem proper, for the issuance of temporary permits for not less than a period of thirty (30) days to persons engaged in the transportation of military supplies and equipment, members of the armed forces of the United States, or civilian workers at any military establishment of the United States when such transportation is done under an agreement or contract with the United States, or one (1) of its agencies, instrumentalities or subdivisions. The method of computing the amount to be paid for such temporary permits in such cases shall be the same as that provided in subsection (1) above.