Rob and I have been PM-ing back and forth but for the forum, I will summarize:
1. Correct tire pressure for load on both axles with a fully loaded and fueled coach.
2. Evenly balanced load (under and inside coach).
3. Correct ride height for both axles (air bag leveling valves adjusted correctly).
4. Good shocks (we had Bilsteins and went to Koni FSD's. What an IMPROVEMENT!!!)
5. Good tires, round and with proper alignment.
6. Axle bearings/king pins lubricated and adjusted properly (requires a shop unless you know how to do it).
That ought to do it. A steering stabilizer will only mask problems if they have not been corrected. They can aid in the uneven road and cross wind fighting but I would do the others first.
Just my $.02.