I had a 1994 33 foot PaceArrow with the 454 P chassis. I did everything to it because it wandered all over. Henderson super steer bell cranks and rear trac bar,got rid of the air bags in the front coil springs and installed henderson springs,inner and outer tie rods,idler arm,steering dampner,ipd large front sway bar with poly bushings on front and rear,Koni shocks,had steering box checked,two sets of tires over the years,a few front end alignments set to henderson specs then even more caster.
All this made a huge differance but still was a bear to drive and would like to switch lanes on its own. I finally fixed it.....I sold it and got a diesel pusher.