Steering Stabilizer on a 1989 P30 Bounder Class A

I replaced the original equipment steering stabilizer with a direct replacement. It made a big difference.
To answer your question directly, you would remove the factory unit if you install Sate T Plus unit.
On your other thread, you were advised about bell cranks. Bell cranks and upper control arm bushings need to be checked. This should be done by a shop that knows their way around light and heavy duty trucks and not automobiles.