Okla. Stat. tit. 60, § 60-175.21: Duties, restrictions or liabilities of trustee -

Trustor may relieve trustee or add others.

The trustor of any trust affected by this act may, by provisions

in the instrument creating the trust, or by an amendment of the

trust if the trustor reserved the power to amend the trust, relieve

his trustee from any or all of the duties, restrictions, and

liabilities which would otherwise be imposed upon him by this act;

or alter or deny to his trustee any or all of the privileges and

powers conferred upon the trustee by this act; or add duties,

restrictions, liabilities, privileges, or powers to those imposed or

granted by this act; but no act of the trustor shall relieve a

corporate trustee from the duties, restrictions, and liabilities

imposed upon it by Sections 9, 10, and 11 of this act.