Economic development revolving fund bonds may be secured by a trust indenture between the authority and a corporate trustee that may be either a bank having trust powers or a trust company. The trust indenture shall contain reasonable provisions for protecting and enforcing the rights and remedies of bondholders, including covenants setting forth the duties of the authority in relation to the exercise of its powers and the custody, use and investment of the money. The authority shall provide by the trust indenture for the payment of the proceeds of the economic development revolving fund bonds and the revenue to the trustee under the trust indenture or other depository for disbursement with such safeguards as the authority determines are necessary.