With regard to the airbag style pinboxes (RE trail-air) - my previous trailer was a Road Warrior - I had a BD3 Hitch in the bed of the truck which had twin air bags. When it was set to the proper air pressure, it was a beautiful ride. Now that I have the Landmark, it came with the MORyde (and I have a 30K RAM hitch)- and I can honestly say the ride is pretty smooth. However, the Landmark does have a much better suspension system - so I'm not sure if that's a major part of the equation.