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The border is a second license
An MC number does not file a customs entry.
A customs broker licensed to file entries is not the same registration as a property broker. In-bond is a customs status, not a kind of trailer.
A dispatcher does not invent a commercial invoice at the bridge, and does not hand the load to a second carrier to make the crossing work. Cabotage rules are fact-specific. Read them before you offer a domestic reload.
The course that goes further is Broker foundation. Reading this note does not enroll you.