I doubt it. I believe that big diesel engines (vehicles more than 14,000 GVWR?) don't use OBD2 - they follow a different standard, i.e. SAE J1939. That's what my 2004 had. But some diesels have OBD II plus the truck standard. Best to call Freightliner Custom Chassis and ask. 1-800-FTL-HELP and have the last 6 digits of your VIN handy.
Former owner of 2004 American Tradition and several other RVs
Home is in the Ocala Nat'l Forest near Ocala, FL