MCA 15-24-201(4) "Mobile home" means forms of housing known as "trailers", "housetrailers", or "trailer coaches" exceeding 8 feet in width or 45 feet in length, designed to be moved from one place to another by an independent power connected to the mobile home or any trailer, housetrailer, or trailer coach up to 8 feet in width or 45 feet in length used as a principal residence.