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Start with the public carrier record
A phone list is not capacity. A docket you can open is a lead.
Look up the legal name and the docket on the public FMCSA snapshot before you call. Then read the public insurance filing. A load-board post is still only a lead.
Broker authority does not haul the freight. A new authority is not illegal, and it is not a federal age rule. If your desk sets an age minimum, write it as your rule.
The course that goes further is How to find carriers. Reading this note does not enroll you.