53 Pa. Stat. § 15374
Any person or persons using any vehicle that is not the property of the licensee, under this act, for hawking, vending, or peddling of any merchandise whatsoever, in the cities of the first class, and which is not properly marked, and which does not have prominently displayed thereon the proper license-plate, shall be liable, on conviction, to be imprisoned for not more than five days, or fined not more than one hundred dollars, or both or either, in the discretion of the court: Provided, That nothing contained in this act shall prevent any citizen of this Commonwealth from hawking, vending, and peddling the products of his, or her, or their farm or garden: Provided, however, That he, she, or they shall be required to make personal appearance, and execute an affidavit to that effect, before the properly accredited officials, and display prominently on the vehicle used a license-plate, for which, however, no charge shall be made.
53 P.S. § 15374