No trailer, auto trailer, trailer coach, travel trailer or camper shall be used for dwelling purposes or as sleeping quarters for one or more persons, nor shall any such trailer or camper be used for storage or space for the permanent conduct of any business, profession, occupation or trade, except that such facilities may be used for temporary residency as the temporary replacement of a damaged dwelling unit and for temporary use as a construction office located on a site during construction or for a sales office subject to Planning Board approval, provided that a temporary permit has been issued for its use by the Building Inspector. This section shall not be construed so as to prohibit the parking or storage of such trailers and campers on private premises, but such storage shall be located to conform to the yard requirements for an accessory building.