No major recreational equipment shall be parked or stored on any lot in a residential district except in a carport or enclosed building or behind the nearest portion of a building to a street, provided however, that such equipment may be parked anywhere on residential premises not to exceed 24 hours during loading or unloading. No such equipment shall be used for living, sleeping, or housekeeping purposes when parked or stored on a residential lot, or in any location not approved for such use. For purposes of these regulations, major recreational equipment is defined as including boats and boat trailers, travel trailers, pick-up campers or coaches (designed to be mounted on automotive vehicles), motorized dwellings, tent trailers, and the like.