Lots of good information here, although much of it is not quite on-topic according to the OP's topic title. I appreciate gutfelt's clarification of the purpose of a rear track bar vs sway bar.
As for track bars, I would guess that it would be especially suitable when towing a car. The car can be a very big tail that wags the dog. Maybe someone could confirm this?
When you focus ONLY on reducing lean, the choices (mostly) are adding larger sway bars or Sumo springs. Both choices are similar costs. It sounds like Sumo is the better choice.
How abut DIY install of these options at home? I could install the bars myself, but the Sumos require the wheels off. Not sure I want to remove wheels in front of my house.