I've never heard of a slide tongue. In fact, I'm not sure that even the swing tongue was available on the 2001 models. The brochures (found on the Wayback Machine) for the 2001 models don't mention either one. As others have commented above, it may be something that an earlier owner added, and the next owner didn't care for.
It is possible (but probably not cheap) to add a swing tongue. We have had two or three threads about it in the past couple years.
Bill
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