Off-street parking facilities accessory to a residential use may be used only for the parking of passenger automobiles, recreational vehicles as defined by this chapter and commercial vehicles a Class 4 or less registered gross or combination weight in pounds (i.e., 11,000 pounds or less), as provided by the Pennsylvania Motor Vehicle Code, Act of June 17, 1976, P.L. 162, No. 81, 75 Pa.C.S.A. § 1916, when such automobiles or vehicles are owned by the occupants of the residential dwelling structure constituting the principal use of that property. The use of residentially zoned property, either private or public, for the parking of commercial vehicles with a Class 5 or greater registered gross or combination weight in pounds (9,001 pounds or more) as provided by the Pennsylvania Motor Vehicle Code, Act of June 17, 1976, P.L. 162, No. 81, 75 Pa.C.S.A. § 1916, or tow trucks, trucks with dump bodies, construction vehicles and equipment such as, but not limited to, pavers, rollers, compressors, welders, backhoes, highlifts or trailers designed, constructed or intended to be used for the transport of such equipment, is prohibited. Not more than one commercially lettered vehicle shall be parked on a residential lot, except when services are being provided to the property.