The significant difference between a class rate and a commodity rate is the type of freight being shipped.
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The rating reflects the cost of shipment from one location to another .
As a general rule the greater the density the lower the freight rate.
If you want to find freight rates charged by a transportation company to deliver different size shipments between two cities you should check the bill of lading.
If your company does not want responsibility for freight damage they should negotiate FOB Destination rates.