Truck Parking. Except for loading or unloading of transient delivery, trucks (not registered as passenger class vehicles) and other commercial (non-passenger) vehicle parking in all R Residential Districts (R-1, R-2, and R-3) is limited to the following vehicles owned by or leased to the occupant of the property: double-wheel, single axle vehicles having a maximum registered gross weight of 11,000 pounds and classified as Class 4 or less by the Commonwealth of Pennsylvania, Department of Transportation. Such parking shall be limited to the rear yard or inside a garage, as defined in this chapter. All such Class 4 vehicles and other such non-passenger class vehicles so parked must bear a current inspection sticker by the Commonwealth of Pennsylvania. Except for loading or unloading of transient delivery, no vehicles exceeding Class 4, and no other commercial vehicles or equipment, including any other vehicle or equipment that is either motorized, self-propelled, or designed to be towed by another vehicle for use in commercial or industrial enterprises, such as air compressors, welding units and the like, or any and all earthmoving equipment, such as bulldozers, hi-lifts, backhoes, ditching equipment, and the like, shall be parked or stored at any time on properties in the residential zoning district.