We had Lippert switch out our Trail-Air with the Trail-Air Tri-Glide (got a heck of a deal at the Coachmen Annual Rally). The ride home was much better.
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I can recommend, so far, the Tri-Glide. I will never be one of those people that says "Oh, we don't even know it's back there", but it is better with one, than without, especially if you have the cruddy roads, that we do.
I hope this pertains to the question the OP is asking. But you can ditto me on the quoted message. I got my Trail Aire/Tri-Glide at the big Forest River Owners Group rally last month in Goshen. I had not pulled the trailer two blocks and I could tell the difference. Does it totally remove the chucking - no. But it takes out the worst of it. Loving that pin box!