After doing the CHF, I think the best Anti sway bar is the one that came with the coach.
Ford F53s come with sway bars installed front and rear. These bars have an adjustment that most F53 owners know nothing about. Its commonly refereed to as the Cheap Handling Fix (CHF).
The adjustment consists of moving the attach links from the front holes on the bar to the rear holes on the bar.
I've made this adjustment on my current and past F53 and the adjustment made a significant improvement in handling, especially in crosswinds and when large vehicles pass by.
You can re-use the original links when doing the CHF, but I'd recommend extending the links by 3 inches. Mine is an older F53, but its exactly the same on all newer F53's
Personally, I wouldn't spend any money on aftermarket suspension components until after performing the CHF and evaluating the change that it made.
CHF – Cheap Handling Fix – Fix for sway and handling – 1999 Southwind 35S
On newer F53 chassis (2006 and above) the rear attach point (sway bar to axle) have a bad record of the bolts being loose, falling out, bending the mount brackets. If you own an F53, keep an eye on this. I'd remove the bolts, install blue locktite and torque the bolts to 65 ft lbs.