All persons hauling or collecting
and
for hire shall haul the same in appropriate garbage trucks, roll-off trucks or other approved vehicles sufficient to prevent any part of the load from falling or leaking into or upon any public street or alley in the city. Such vehicles shall at all times, except when loading or unloading, be kept covered. There shall be printed on both sides of such vehicles in clear, legible type the name and telephone number of the owner of such vehicle.