First, think about the mechanics or physics involved with that 'pathetic' square tube. In order for the MH to sway to the left that tire must move closer to the chassis and the leaf spring must flatten out, less arc. On the right side the opposite happens. The tire moves farther from the chassis and the spring must arc more. In order for that to happen that square tube has to twist. No different than what you consider a conventional anti-sway bar, the twist or torsion of the anti-sway bar tries to keep both wheels at the same distance from the chassis.
I have a Winnebago on a W22 chassis, square tubes front and rear. Originally 2'5" rear and 2" front. Workhorse changed to 2.5" front and rear and I made the upgrade on our MH. You can feel the difference. Our previous MH was on a P32, leaf springs in rear and independent front with coil springs. Conventional style anti-sway bars front and rear. Not sure what a 2005 P32 has.
What is your real problem? Is it sway or the 'tail wagging the dog'? When a semi passes does it push the rear to right, making you turn to the right the back to the left again? That's different than sway. Just asking so you attack the correct problem.
If it's 'tail wagging the dog' then a track bar will help. Leaf springs can allow the axle to shift side to side under the MH. A track bar stops that from happening. Sway is the whole MH swaying, top to bottom from side to side. Anti-sway bars can help that. Be aware that you can over do on anti-sway bars. They try to keep both sides in equilibrium. So when going slow, say up a driveway of over a pothole the anti-sway bars will try to keep both wheels the same distance from the chassis and actually cause more sway. Just some things to think about.
Good luck.
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Hank & Lynda
2003 Winnebago Adventurer 35U, Workhorse W22
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