Patrick,

I have zero CC experience. I would talk to Prevost engineering to see their thoughts on the air bags you have versus the ones Prevost supplies as original equipment. There is a lot going on under the coach under various conditions that prevent us from verifying clearances. We cannot duplicate the different extremes up or down, wheels turned left, wheels turned right, etc. As you can imagine there are a lot of moving parts in proximity to the air bags and clearances are very small. Due to the risk of an air bag failure I suggest you speak directly to Prevost Engineering.

It is obvious what you currently have is not working. Having said that however, do not rule out motion on parts that should not move. Your air bags may be the correct size, but maybe there is a failing bushing or ball joint and the chafing you see is a result of that. I presume that is not likely but when you see such indications particulalry with steering involved it is better to verify the cause.

One final point. I am not familiar with IFS, but on my coach the shocks limit up travel. If you do not use original equipment air bags, make sure the substitute does not have insufficient up travel, or too much up travel such that the air bags can exert enough force to snap the end ring off. Insufficient up travel adversely affects your ability to level the coach.