Here is the link for Air Safe hitches.
Hitches for a smoother ride | Air Safe Hitches
They make air bladder hitches for all sorts of trailers, including TTs, 5ers, and goosenecks.
Personally, I don't have any need for an air bladder hitch. I've towed an 8,000-pound 5er for around 100,000 miles with an ordinary mid-priced Reese 16k hitch with 4-way tilt. I've towed my 5,000-pound TT and 7,000-pound cargo trailer around 20,000 miles with a Reese Strait-Line weight distributing hitch. Recently I relegated the Strait-Line to the cargo trailer and installed a ProPride hitch on the TT. None of those three hitches include any sort of air ride, and I haven't even thought maybe I might need an air ride hitch.
I suspect if you think you would need air ride hitch, then the weight is not properly distributed in your trailer to result in at least 12% tongue weight or 17% pin weight or 20% gooseneck hitch weight.