Then you might have the dual row bearing, of which's failure rate seems correlated to maintenance/oil changes, and not the design itself.
Unfortunately, you have a 2000 model, during which (supposedly) the design was switched mid-production from single, to dual row. From what I can gather (correct me if I'm wrong, forum) the only way to know for sure on a 2000, is visual inspection.
FYI to everyone with 2001, and up, the lawyers that are handling the case have made this very easy now, with the latest "Class Vehicles" hooked into a database. Just enter your VIN. If it's not listed, you might have the dual row.
Class Vehicle VINs | Knapp Petersen & Clarke