(a) A deed of trust lien conferred on the physical property may be combined with the trust indenture authorized by this chapter.
(b) The trust indenture or deed of trust may provide for:
(1) the security of the bonds and the operation and preservation of the trust estate in the manner prescribed by the board;
(2) amendment or modification of the trust indenture or deed of trust; and
(3) the issuance of bonds to replace lost or mutilated bonds.