The agreement is pretty simple. It's an oral agreement - they're the ones that are not enforceable unless there is a duty to perform (Business Law 101). Not directing this at you, BTW.
Hello, Port, I have a shipment of TYTN tractors coming in. Do you have some space for me?
Hello, Mark. Not a problem, just as we previously discussed.
That simple. Why, with the latest news, are we still going back to this nonsense???