I put Hellwig RV sway bars on both front and rear of my 28Z (E450) and it made a tremendous difference.
The installer told me that on an E450, a sway bar will fix problems... a steering stabilizer fixes symptoms. Apparently he likes the sway bar approach. I can't tell you which one is the best as I have only upgraded sway bars.
But I suspect both approaches will fix problems, so the best answer might be both.
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The only thing that works on a RV is the owner...
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