In 1996, Freightliner acquired the Oshkosh (previously John Deere) X-Line chassis. They are currently sold under the Freightliner name and used by coach builders such as Fleetwood and Winnebago.
Under the Freightliner brand, all XC, XCF, XCL, XCM, XCP, XCR, XCS chassis VINs begin with 4UZ. Generic VIN decoding websites do not give much insight into the particular configuration of the RV chassis, however Freightliner supplies convenient decoding charts, viewable below (click page up/down button to navigate)
VIN decoding chart for models built before April 30th, 2000:
VIN decoding chart for models built May 1st, 2000 and later:
For DIY service and maintenance information on the 1996+ Freightliner XC chassis, we highly recommend the workshop manual. We also carry corresponding Cummins, Cat and Detroit engine manuals.