Express Excess baggage to Belgium from United States

I am due to give a presentation at the university at Belgium toward the middle of next month. My potential problem is that I will have to take more baggage with me than most of the airlines allow without having to pay a large fee. Therefore, I came here to request information regarding express excess baggage to Belgium from the United States. I prefer to ship my express due to the fact that I do require these bags to arrive at least at the same time as I since I need the contents of this baggage for my presentation. Please email me with how much this will cost. My excess baggage totals 4 normal sized suitcases. These bags will also weigh about 15 pounds apiece. Can you guarantee my bags will be delivered on time? What are the remedies if they are late or misdirected? I do desire for the baggage to be insured. How much would that insurance cost? I want to finalize my travel arrangements within the next two weeks, so your prompt response will be greatly appreciated. Thanks.