Okla. Stat. tit. 60, § 60-140: Surplus liable to creditors

Where a trust is created to receive the rents and profits of

real property, and no valid direction for accumulation is given, the

surplus of such rents and profits, beyond the sum that may be

necessary for the education and support of the person for whose

benefit the trust is created, is liable to the claims of the

creditors of such person, in the same manner as personal property

which cannot be reached by execution.