18 Pa.C.S. § 7365: Trading in motor vehicles and trailers.

(a) Offense defined.--A person is guilty of a summary offense if he engages in the business of buying, selling, exchanging, trading, or otherwise dealing in new or used motor vehicles or trailers, on Sunday.

(b) Repeated offense penalty.--A person who commits a second or any subsequent offense within one year after conviction for the first offense, shall be sentenced to pay a fine not exceeding $200.

(c) Definitions.--As used in this section the following words and phrases shall have the meanings given to them in this subsection:

"Motor vehicle." Every self-propelled device in, upon or by which any person or property is or may be transported or drawn on a public highway.

"Trailer." Every vehicle, without motor power, designed to carry property or passengers or designed and used exclusively for living quarters wholly on its own structure, and to be drawn by a motor vehicle.