Fiancé of missing woman takes over as trustee of ranch near Idyllwild | cbs8.com
According to the above interview,
and assuming Isidro is correct, it sounds to me (my guess is) that Harper is the 1st Successor Trustee, and Diana is the 2nd Successor Trustee. The 2nd Successor doesn't act unless the 1st Successor is unable. Otherwise they would be Co-Trustees and act together equally.
In the information below Dia would be the "Settlor".
From page 15,
https://www.ialawfirm.com/docs/ARAG_Guidebook_Revocable_Trust.pdf
"
Co-Trustee or Successor Trustee
Every Revocable Trust has other Trustees. The Settlor may set up the Trust with a Co-Trustee to act with or in the place of the Settlor as designated in the Trust instrument. Since the Revocable Trust is intended to address periods of the Settlor’s incapacity and the Settlor’s death, all Revocable Trusts will have one or more Successor Trustees who gain authority once a triggering event occurs (as set out in the Trust instrument). The Trustee is a fiduciary with enforceable duties to the Settlor and the beneficiaries. A Trustee has duties imposed both by the terms of the Trust instrument and by the law of the state where the Trust is administered."
As far as I understand it, Successor Trustees have a responsibility to do what the Trustee/Settlor (Dia) wants per the terms of the trust. And they have a responsibility to Dia's beneficiary(ies). This is kept going until Dia is no longer incapacitated and resumes control, or she is declared dead. If she is declared dead then the beneficiary(ies) receive what they are entitled to under the trust. And the beneficiary(ies) and Successor Trustees can be different people (or perhaps a beneficiary can be an entity rather than an individual, ie an organization that controls wildlife preserves for lack of better terminology).
MOO: No, it does not seem to me that a Successor Trustee has a legal right change things around/do whatever they want.
However, if a property within the trust were no longer able to be sustained financially
I am assuming the Successor Trustee
might be able to legally sell other assets/properties to keep the fundamentals of the trust going.
For example, per the trust, if it were imperative that the Ranch become an animal sanctuary, but there are insufficient funds to keep maintaining the Ranch, then the Successor Trustee
might have the legal right to sell other assets to continue to maintain the Ranch.