How often or ever should the tires be rotated on a c ?

I can't think of any practical way to do this. In my case, and probably in most others, you would have to take the MH to an RV repair facility and have them dismount the wheels and also remove the tires from the rims, then switch them out. Since the front and rear wheels are different, I can't see any other way to do it. Seems like it would be very expensive and probably not worth the trouble.