I have the W22 and put air bags on all four corners. We travel a lot in the Great Plains where high winds are pretty normal, especially in the Winter months. On SMOOTH Interstate roads, I can crank the air pressure up to around 80 PSI and my body sway is so little that I can handle 50 MPH winds. Once the wind is gone, I drop the pressure back down to 20 PSI. On rough roads, my speed is usually less and I can get by with 50 PSI. Semi push is almost non-existent. I have the air compressor that came with the Air Lift bags and I can adjust the pressure up or down, on the front or the rear axles, as I drive.
I do not have, and I will not buy, a trac bar for this coach. I had one on a previous coach and the air bags work better. The W22 comes with a large anti-sway bar that is very effective since it is rigidly mounted steel to steel with no rubber bushings. It is the large square beam by your axles.