Recreational equipment, including camping trucks, motor homes, camping trailers, boats, boat trailers, and similar equipment may be parked or stored on premises. Recreational equipment stored or parked within side yard setbacks shall be permissible provided the occupants of the adjoining property consent thereto. In no case shall more than two pieces of recreational equipment be stored that are not within an enclosed building. All recreational equipment must be properly licensed and in operable condition. No recreational vehicle shall be used as a storage facility.