The agreements and leases shall be duly acknowledged before a person authorized by law to take acknowledgments of deeds and in the form required for acknowledgment of deeds.

The agreements, leases, and equipment trust certificates shall be authorized by resolution of the board and shall contain covenants, conditions, and provisions that may be deemed necessary or appropriate to insure the payment of the equipment trust certificates from any legally available source or sources of funds as may be specified in the certificates.