The parking of trucks, trailers, recreational vehicles, industrial tractors, mowers and other related equipment and any vehicle exceeding two (2) axles on any street or alley within a district zoned residential is prohibited, except for the immediate loading or unloading of persons or materials. No commercial truck exceeding two (2) axles or in excess of a length of fifteen feet (15') or both shall be allowed to park in any area of the town zoned as a residential district. (1998 Code)