Hello! I'm so sorry for the delay. I just now saw this profile comment... don't know how I missed it.
Yes.. we love our sidewinder with the air ride! In 2012 I believe it cost us about $800, supposedly dealer cost. So I was surprised at the prices I'm seeing now. I believe our model is the 5AS16K. I see the prices from $900 (Jet) to $1200, to $1600.
And yes... the shock and air bag substantially helped with the chucking. Previously we had just the side winder with no air ride. The air ride makes all the difference
I did find this different model at Jet.com that looks like the same thing but much cheaper. It won't let me post the URLs today for some reason. But just do a search on 'fifth airborne sidewinder hitch'.
Let me know if you have any questions! Sorry again about not seeing your message.