We had chucking " fore and aft" jerking and bridge transition "bouncing" issues when our rig was new. I think I started in the wrong order . Address leveling , loading and suspension issues before changing pinbox. The Trail air Tri glide was a big improvement in chucking. Maybe 50% . Next was leveling and adding shocks to our trailer. That helped even more. We still had that bouncing and chucking at bridges and large bumps. I went with Bilstein monotube 4600 shocks on our truck. Wow ! Big improvement with bouncing.
With all that said we now have a very comfortable ride with no bouncing a only very slight soft chucking motion at times. Overall I would say we have an excellent ride. Hope this helps.