The number of Trustees

(1) Unless the terms of the trust provide for a greater number, the minimum number of trustees shall be one. (2) A trust shall not cease to be valid only on the ground that there is no trustee or fewer than the number of trustees required by the terms of the trust. (3) Where there is no trustee or fewer than the number of trustees required by the terms of the trust, the necessary number of new or additional trustees shall be appointed, and until the minimum number is reached, the surviving trustee, if any, shall act only for the purpose of preserving the trust property. (4) Except in the case of a trust established for a charitable (a) the number of trustees shall be not more than four; and (b) if at any time there are more than four persons named as trustees, only the first four persons so named shall be the trustees of the trust.