Just to add a couple technical items to this:
In the automotive industry this "bar" is called a Panhard Bar and "Track Bar" is a term used more in the racing world. They are the same bar but in use the racing world does things with it you DO NOT want to do with a motor home.
Racers raise and lower one end of the "Track Ba" in order to have the geometry of the rear suspension change as the car corners. As the car rolls in the turn the driver may want more or less offset in the rear. As the track bar is raised above or below the plane of the bracket on the rear axle it causes more left or right offset. When the pivot points are on the same plane there is little or no offset on roll or bumps. Changing offset at 180 mph+ can affect cornering.
On a Motorhome the ideal mounting position is when the frame mounted pivot end is as close as possible to the same plane as the pivot on the Axle. In short, with vehicle loaded as it drives down the road you want the measurement from ground to pivot bolt to be as close to the same as possible. If excessive, as your vehicle rolls in a turn or hits a bump, the axle moves left or right. It's the same principle as if you are trying to install a 2X4 lengthwise between two studs and it's too long. If you pound it down one or the other stud will be displaced.
Just a technical note. Should handling get worse after installing a panhard/track bar this would be a good place to check, the bracket locations.
FWIW, I've seen this become a real problem on lifted trucks where the "lifter" merely installed a longer panhard/track bar. Also common on front steering when lifted or there is a severe difference between caster from side to side. Outer tie rod ends need to be same height (or as close as possible) or bump steer is a major issue.
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