Good to know. Mine’s very similar to a Mini in size... only a couple inches bigger here and there. Only with duallies hanging out on both sides. It has almost zero body roll in the corners. The 4000lb/side rear springs really stiffened it up. With Moog Progressive front springs and new Bilstein shocks, it’ll handle most twists roads at well above the speed limits. So I’m dubious a sway bar will do that much to control a 6000 lb box at high speeds. Lower speed it’ll do more.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.