If you are shipping LTL (less than a full truckload), be sure you understand the route your goods will take, where and when they will switch trucks, and how long it will take them to reach their destination. Choose a shipper that will give you a tracking number, or at the very least a cell phone number, so that you can be sure of where your items are.
Before you commit to a carrier, ask about their policies in case a shipment is lost or damaged. Check with your insurance company about whatever coverage you may need.
Be sure you follow your shipper's recommendations on packing your shipment. Some shippers reserve the right to charge you for repacking a shipment that appears to be insecure.