I have never heard such allegations about Trinity.
It seems that they have an elected board and this is the first time that I have heard Trinity or Ole Anthony described as "authoritarian."
Frankly, the group doesn't seem like a "cult" to me, based upon its disclosures through 990s, Charity Navigator etc. or through any contact that I have had with them over the years.
Sounds like you might have differences with Trinity over relious beliefs.
But it is behavior, dynamics, structure of a group that defines it as a cult according to Singer, Lifton etc. not its theology.
It will be interesting to see if others come forward as you say to echo these sentiments and offer further evidence to support your conclusions.
No one has every emailed or contacted me regarding problems with Trinity as an ex-member and you are the first to post about this here.
What Trinity is most known for is exposing televangelists that seem to be more focused on making money and living well than theology or sharing their faith such as Benny Hinn, Robert Tilton and most recently Trinity Broadcasting Network.
The work of Ole Anthony and Trinity in this area has helped the general public and the network television investigative teams have not uncovered anything about Trinity or become suspicious it seems while working the organization or Anthony.
Your wife's book is certainly a first in its claims against Trinity.