Different types of products have different shipping costs associated with them. Generally a product that is heavier and takes up less space will have a lower cost associated with it than a product that weighs the same amount but takes up more space. Confirming you are using the proper freight classification is one way to ensure you have the lowest shipping costs.
 
The BOL is the most important document in the shipping process. It is required for each shipment, and acts as a receipt and a contract. A properly completed BOL legally shows that the transportation provider has received the shipment as described and is obligated to deliver that shipment in good condition to the consignee.
 
All claims (damage and shortage) must be filed within nine months of delivery. After nine months, the carrier cannot accept liability. If an entire shipment is lost and never delivered, the claim must be filed within nine months after the shipment should be reasonably delivered.

When you receive a shipment inspect it immediately for obvious signs of damage. Compare the number of shipping units received to the number listed on the delivery receipt. Always sign for pieces and pallets. Do not sign as “said to contain” as it will affect your ability to file a claim after the fact.

No two major carriers base rates are the same. Each carrier's rates are based on THEIR costs. Even though two carriers may have the same discount there are a number of factors that effect who has the lowest net rates.