XML Freight Link

I need an XML application to bring in live LTL Freight shipping rates from carriers such as Fedex Freight, Yellow Freight, Roadway Freight, etc. All of the shipments on my website are too large to ship via UPS or FedEx ground (small package carriers). I can pull account specific Roadway freight rates from www.Roadway.com. But I would like the XML from Volusion to feed order data directly into Freight Rate software such as: CZARLITE [login to view URL] or Transite [login to view URL] I am assuming there is an XML method of sending the weights and shipping zip code of the order from the Volusion shopping cart to the CZARLITE or Transite interface and then having the t interface return my account specific shipping rate to the Volusion shopping cart and displaying that rate to the customer.