The use of trailers or modular office buildings as accessory buildings shall be temporarily permitted at a site for which a building permit has been issued for development of land. Upon completion of the approved project, such trailer or other temporary structure shall be removed from the site unless specifically authorized by site plan and/or subdivision application approval by the Planning Board or Board of Adjustment. No trailer or modular structure not permanently affixed to the ground shall be permitted unless approval is granted in accordance with the Land Use Ordinance of the Township. Trailers or modular buildings used as an accessory building must be approved in accordance with the Land Use Ordinance of the Township. This subsection does not apply to recreation trailers or campers parked on a lot on which a home is also located.