18. Trailers, Trucks, School Buses. No house trailer, mobile home, habitable motor vehicles of any kind, school bus, truck (other than a passenger vehicle commonly known as “pickup truck” which has a gross vehicle weight rating of less than 26,000 lbs.), or other commercial vehicle shall be kept, stored, or parked overnight on any lot or on any roadway within the Development except as allowed by these Restrictions. No commercial vehicle may be driven on the roads within the Development except for deliveries to lots within the Development.