Tried to reply to my original post of the same title, but couldn't due to date since last post.
UPDATE: I would have given a more timely update to this.. however health events prevented me from driving the coach for the past year. Last April I ordered and had installed Source Engineering Bilstein shocks, trailing arms and the "handling kit" -- new airbags and ping tank. While coach was in shop unplanned events ocurred. I had driven the coach app. 30 miles in the past year due to my health problems. Last week, I took it on a 1200 mile trip.
WOW and Amazing is how I describe the difference. It now rides sooooo smooth and soooo comfortable. In that entire trip, I only noticed one bridge joint that was rough where as in the past it was a jaw gritting ride. Trucks passing were barely noticeable.. more to their nose than anything. The difference of before and after is just unbelievable.
Was it the shocks?
Was it the trailing arms?
Was it the airbags?
I don't know and don't really care.... I can tell you it now rides so amazing and so much better.
Thanks to everyone for their advice on this issue.!
Hugh 'n Deb - USAF Retired B-52 Pilot
2004 Safari Zanzibar 40', F-150, BlueOx TowBar, SMI AF1