After choosing a carrier for freight shipping, consult a representative to be sure you are following proper packing and labeling procedures.
Be sure you and your carrier are in agreement about the level of service required.
For instance, is there a loading dock at the start and finish of the journey, or will your goods require a liftgate? Such services will cost you more, as will any part of the journey that requires the driver to do more than drive the truck -- delivering your trade-show display inside the convention center, for example.
Also be clear on how and when payment will be made. If the driver is to pick up a check from your customer on the other end, expect a surcharge to be taken off the top.