It shall be unlawful for any person to display or allow to be displayed for sale or lease at one time on any lot any motor vehicle; boat or vessel subject to registration under V.T.C.A., Parks & Wildlife Code, Chapter 31; or camper shell designed for use on a motor vehicle unless such vehicle is owned by the actual occupant of the premises. However, no person or persons shall be permitted to display more than two, or combination thereof, of the following: motor vehicles; boats or other similar vessels subject to registration under V.T.C.A., Parks & Wildlife Code, Chapter 31; or camper shells per lot at any time.