The board of trustees of the firemen’s insurance and inspection fund in unincorporated communities is composed of the treasurer of the county in which the greater part of the community is located and any residents of the community as may be appointed by the treasurer, on a recommendation by a majority of the legislative delegation or delegations of the county or counties in which the community is located. The term of office of the members, other than the county treasurer, is four years, and they shall serve until their successors are appointed and qualify for office.