here's a link to an interesting write up I found on this topic.
MH handling
I've done quite a bit of research on this issue, and have come to the conclusion that the worst of the handling issues on the E-450 chassis are due to a lack of sufficient positive caster angle, so that the steering system doesn't have a nice return to center.
The rest of of it, I think, is mostly due to the leaf springs on the rear... which would mean that a panhard rod is the real fix for that part of the issue.
On mine, the truck alignment shop I visited (Josam's in Orlando) couldn't get enough caster, because it's a tradeoff adjustment with camber. Any more positive caster would make my camber angle too far out of spec resulting in a bad bump steer problem. According to some forum posts I've read, there are some aftermarket bushings out there that are supposed to address this.
It seems to be the other options out there such as sway bars address other issues, that based on the many positive experiences out there, will have a secondary effect on the problems we have...
the steering track devices such as safe-t-steer, the roadmaster spring loaded stabilizer, etc... don't fix the steering's lack of center, but the fix the symptom. It seems their primary benefit is as a safety in case of blow-outs, but they indirectly help.
On my E-450 MH, I don't sense the roll as much of a problem.
Summing up, IN MY CASE, I think better caster angle along with a panhard rod on the rear are the fixes, and safe-t-steer type device on the front as a safety for blowout steering will help to make the drive a bit more relaxed.
Oh, and the easiest and best thing to do right away is to correct the tire pressures based on load/pressure charts. It makes a big difference!
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