I think that just maybe I might but I am not telling NYA, NYA!
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Sounds like to me you are trying to go after the bif in a direct way. I take it the first one about a load of dispatcher brains would go with the load of sailboat fuel meaning each are nothing more than a bunch of air.
I think it means a person that is clueless or brainless, empty headed.
Dispatchers are always messing up! A sail boat moves on AIR! So you have a load of air!
After all these months and no one has got this...The correct answer is, The trailer is empty. That is it.