I would be a complete idiot to do a job like that. The supplier is bound to be aware of the transport method I would be using. He will likely see the tail number. Then he's got the pilot by the goo11ies for ever afterwards.
And that's assuming that the supply chain is not already under surveillance, which is pretty unlikely.
I very much doubt light aircraft play a significant part in the total volume imported. Far too much hassle, weather risk, etc. Boats.... that's something else. But vehicles must be doing most of it.