I have the Morryde pin box. Frestone airbags on the truck and the Trailer Saver BD3 air ride hitch in the truck. The ride is smooth.
Starting over I might go with the Trailair air bag pin box and a solid hitch and the truck air bags, much less money if the pin box works as advertized.
The truck air bags keep it from smacking the bumpers on a bridge crossing type of bump, the bags replace the bumpers and are much smoother. they also allow some leveling adjustment. The BD3 air hitch is truly very effective at allowing the 5th wheel to float rather than flex its frame to absorb these bumps. It's expensive but now that I have it I love it.