On our small Class C I can feel it in the handling when one tire of a rear dually set is flat. The control seems soft and mushy - like something definitely is wrong back there.
The one good tire of rear dually set is not designed or inflated so as to carry the whole weight in one rear corner of a motorhome, so it's pretty obvious when the one good tire on either side is carrying this much weight over it's limit. It's way different than when one tire blows in the rear of an empty or lightly loaded dually pickup - in which case the whole weight of a corner back there can be safely handled with only a single good tire on either side.
P.S. I had a rear tire from one dually set deflate once when driving our 24 foot Class C ... and I can't imagine how much more dramatic is must feel with a flat in a rear dually set of a larger Class C.
