No question, the driver has the legal responsibility to ensure the load is safe and secure for travel on the roads, regardless if it is a flat bed or closed van. In addition, the shipper must ensure that any load or shipment that they offer to a carrier, must be able to withstand the regular rigours of over the road transport. As an example, no one would offer loose eggs for transport that weren’t probably packaged, or sheets of glass. Your best course of action is to file a freight claim with the carrier. You could also advise your own insurance provider of the situation in case the carrier’s insurance declines the claim. Try to use this situation as a learning experience for your customer to prevent future similar problems. Last, but not least, be prepared to perhaps lose a customer, some money, or both.