. A track bar (Panhard Bar) is used to reduce the side-to-side movement of a solid axle mounted on leaf springs or air bags. Older GM gas chassis had independent front suspension, so a track bar isn't needed except on the rear axle. Later Workhorse gas chassis, and Ford gas chassis, have solid front axles so can use a front track bar along with one at the rear. I suspect Diesel pusher chassis with air bags and solid axles front and rear already have track bars. Again, independent suspension doesn't need a track bar.
Originally Posted by Selah
.. On gas coaches one thing that help mitigate wind push is to have track bars on both front and rear...
George Schweikle Lexington, KY
1999 Safari TREK 2830, FMCA 190830, Safari International chapter
1995 Safari TREK 2630, 1983 Winnebago Chieftain, 1976 Midas Mini