If its a Freightliner, it will be an XC chassis. Problem is, that label doesn't tell you very much. Freightliner offers a several different base designs under the "XC" label, and each of those has a dozen or more configuration options the motorhome manufacturer can select.
Contact Freightliner Custom Chassis Customer Service and have the last 6 digits of your VIN handy. They can give you the details of what you have, i.e. axles, suspension, brakes, tranny & engine, etc.
Former owner of 2004 American Tradition and several other RVs
Home is West Palm Beach, FL