Do I need the High Performance Wheel Kit if my Cruiser or Hauler is already all-terrain?Updated 2 hours ago

Not usually. The standard soft-tread wheels handle pavement, grass and gravel well. This kit is for the ground beyond that—rock, root and washboard—and for loads that suffer from being shaken: a sleeping kid in a Cruiser, a dog, anything fragile. If your rough days are occasional, the standard wheels are fine. If they're most days, this is the upgrade.