Any person who shall carry on or engage in the business of buying, selling, exchanging, dealing in or trading in new or used motor vehicles; or who shall open any place of business or lot wherein the person attempts to or does engage in the business of buying, selling, exchanging, dealing or trading in new or used motor vehicles; or who does buy, sell, exchange, deal or trade in new or used motor vehicles as a business on the first day of the week, commonly known and designated as Sunday, is guilty of a misdemeanor for the first offense, and a gross misdemeanor for each succeeding offense. This section does not apply to the sale of (1) trailers designed and used primarily to transport watercraft, as defined in section 86B.005, subdivision 18, (2) trailers designed and used primarily to transport all-terrain vehicles, as defined in section 84.92, subdivision 8, (3) trailers designed and used primarily to transport snowmobiles as defined in section 84.81, subdivision 3, or (4) utility trailers as defined in section 168.27, subdivision 20.