Trailair
This was on the trailer when we bought it. Ride was extremly smooth. Added the air bags only to help level the truck out. Did not make a difference with the handling of the trailer. After you hit a bump or on a bumpy road, if you look in the rear view mirror you can see it moving but hardly feel anything on the truck
With our trailer we also got the air bag hitch and WOW !! Is all I can say I was pulling a 24.5' Terry Quantum befor our toy hauler and me and my wife both agree the toy hauler pulls nicer, we also out the Trail Air suspension on all of the axles makes for a real nice pull. One thing I have noticed with pulling our trailer is it pulls nicer with our Rhino loaded then with out.