I didn't see it mentioned in this thread, so before adding a bunch of aftermarket stuff, this is what worked for my 2002 Horizon 36'. First thing was to have the coach loaded as typical for your trips, and then have ride height set correctly. This is an important adjustment, and it must be exact. Freightliner has the specs for your particular coach. Call their tech support in Gaffney for the spec sheet.
I installed a Henderson BallBearing bellcrank for the steering arm, as the oem had a rough spot near the center.
Then I had a 4 wheel laser alignment performed, not just a front end alignment. Turned out the rear axle was out of alignment with the frame and the front. The alignment was done at a Freightliner Oasis facility, but can also be done at the factory in Gaffney.
Tires should be balanced (I had front spin-balanced; rears with the balance beads), and tire pressures set for a safe margin above what's needed, and install a TPMS, so you know if one is losing air.
With this work done, it drives beautifully; no wander at all. And this is a 36' rig, not a 40 or 42. Simple and effective improvements. However, I've now had my coach for 15 years, and still no issues.
