Final answer:
The best action to take if lumpers are needed for unloading a shipment is to inform the carrier in advance and include lumping fees in the contract to ensure all costs are clear and agreed upon.
Step-by-step explanation:
If you are aware that the driver will require lumpers to unload a specific shipment, the best course of action is to inform the carrier in advance. This allows the carrier to accommodate the additional requirement either by arranging for lumpers themselves or by preparing to pay for lumping services at the destination. Including the lumping fees in the contract is also good practice, as is any action that aims to ensure these costs are accounted for and transparent to all parties involved in the shipment.