Notwithstanding any other provision of this chapter, the parking of trailers, trailer coaches, camp trailers, camp cars and house trailers in any zone is prohibited, except that this prohibition shall not extend to those used as temporary field offices on construction projects and those owned by a property owner of the Township of Greenwich; provided, however, that said trailer, trailer coach, camp trailer, camp car and house trailer shall be parked within the yard setback requirements of the residential zone in which it is parked and in no event shall they be used for a dwelling or sleeping purposes.