All we have done to ours is added a Roadmaster stabilizer (alternative to Safety Plus) and set tire pressure based on real weight. Am going to add bigger sway bars but there is no real urgency.
I noticed once initial crown wore off front tires, it tracked much better. That happened at the 10,000 mile mark. We are now at 24,000 and unit handles fine. If I do not go to opposite edge of lane it will get pushed by semi's. Running as much gap as safe, virtually eliminates push. Cross winds seem to push everything.