R.I. Gen. Laws § 45-50-15
In the discretion of the authority, any bonds issued under the provisions of this chapter may be secured by a trust agreement by and between the authority and a corporate trustee, which may be any trust company or bank having the powers of a trust company within or without the state. The trust agreement or the resolution providing for the issuance of the bonds may pledge or assign the revenues to be received, and may convey or mortgage or grant a security interest in any project or any part of it or any combination of projects or parts of them. The trust agreement or resolution providing for the issuance of the bonds may contain provisions for protecting and enforcing the rights and remedies of the bondholders or noteholders as may be reasonable and proper and not in violation of law, including covenants stating the duties of the authority in relation to the acquisition of property and the construction, improvement, maintenance, repair, operation, and insurance of the project or projects in connection with which the bonds have been authorized, the custody, safeguarding, and application of all moneys, and conditions or limitations with respect to the issuance of additional bonds. It is lawful for any bank or trust company incorporated under the laws of the state which may act as depository of the proceeds of bonds or of revenues to furnish indemnifying bonds or to pledge securities as may be required by the authority. Any trust agreement may state the rights and remedies of the bondholders and of the trustee, and may restrict the individual right of action by bondholders. In addition to the preceding, any trust agreement or resolution may contain any other provisions that the authority may deem reasonable and proper for the security of the bondholders. All expenses incurred in carrying out the provisions of the trust agreement or resolution may be treated as a part of the authority's cost of operation and maintenance.
R.I. Gen. Laws § 45-50-15