Chalking things up to poor communication is like saying that the key to standardizing deployments is better documentation. Its true that a wiki can work, but why leave it up to human error when there is a better solution which is automation? Automation is essentially working documentation so you were right if you said the answer is documentation, however, I would give a better grade to the person that answered 'working documentation' over 'documentation'.
The problem we are talking about here is having people and teams come out of sync that can result in integration issues later down the road. Better communication is the right answer. To me, trunk based development essentially means 'working communication'.
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