Seems like Ben and I had the same problem this past week. I needed to remove the chrome axle cover on the drive axle and I discovered that you have to have a widget that looks like an allen wrench with a hole in the middle to remove the locking screw that allows the whole thing to come off.
After searching the likely hiding places in the coach, I deducted that one of these didn't come with the coach.
Does anyone know where you get them? Unless Lew has a spare.....