We had a Sabre that we ended up adding a Trail-Air pinbox to. I honestly didn't feel a lick of difference before and after it. We then later added shocks to the camper and again, didn't feel a lick of difference.
Fast forward 6 years and a camper change, through a variety of events, we sprung for a Trailer Saver TS3 hitch. It's a world of difference!
http://www.trailersaver.com/product/ts3-air-ride-hitch/
It's just not cheap. I have a bit over $3,000 into this hitch. Worth it for a wife who has back issues.
I'll also say, I had the B&W Companion hitch, the Andersen Ultimate pyramid thing, and the Trailer Saver in the same truck and with the same trailer. The ride was passable with the B&W Companion but absolutely sucked with the Andersen (literally had my wife in tears on back to back travel days). The Trailer Saver was the king of the best ride.