Re: Is a panhard bar worth the effort and money?
The effects of the Panhard cannot be compensated with the drag link.
If the Panhard is at an angle it "Pushes" the axle from side to side as the axle moves up and down. That "push" causes the vehicle to wander around on the road. The more angle, the less of a little bump it takes to "push" it.
The drag link makes the wheels turn as it bounces, a different problem altogether.
It would be near impossible to make the wheels turn exactly the right amount to compensate for the axle sideways movement. If it did, off road where bouncing is more severe, the drag link would turn the wheels so much you'd have trouble going straight at all.
Both should be parallel to the ground, but the drag link is pretty hard to do that with.
As far as articulation goes, if the Panhard was level, the axle would have to droop an awful long way to have it inhibit movement. Leaf spings can't drop that far.
Notice on coil suspensions, like long arms. They HAVE to have to a cross locator or Panhard. They droop far longer - and the Panhard doesn't affect them. It will make bumpsteer when way down, but when it's that far down you don't notice it.