Prevost applies the foam. When in the fully deflated condition the coach is supported by internal bump stops in the air bags. I have never tried to measure if there was space between the tire and the sound deadener i the wheel well, but I do know mine does not show evidence of having been worn or damaged by a rolling tire. Based on that I am sure my coach has space.

I have a beam axle so I cannot even guess the situation with the IFS front suspension. I think the best way to determine if your coach is normal or has a problem is to look at other coaches with the IFS.

I would not drive the coach at highway speeds with a deflated air bag, but could be convinced to drive it at walking speed to a safe place not too far away.