My 1998 minimod came with IPD sway bars front and rear. Big n beefy! It handled really well on curves. To the point I had to remind myself what I was driving up a steep twisty highway. I had some sway, but I think it was from old shocks. With that big, heavy box on there, I think a sway bar is always going to help. Handling doesn’t matter, until it does... if I have to swerve/recover/etc, it’s good to be as prepared as possible.