Now I once again have egg on my face!
Instead of taking Winnebago's specifications at face value, I went out just now and actually measured my coach's width from left trim-strip edge to right trim-strip edge .... our Itasca Class C is 100 inches wide, NOT 101-102 inches. Since ours is on the wider-rear-stance Ford E450 chassis, each rear tire's sidewall comes out almost to the edge of each coach wall.
I'd much prefer Ron's Class C width since we sometimes travel on narrow off-roads ... but with still a cab overhead queen bed along with the rear corner queen bed. However, I have so far never found a non-Sprinter-based Class C with Ron's/our floorplan and an overhead queen bed that is only 93 inches wide ... but if it exists it will be using the lighter duty E350 chassis with it's narrower rear stance. One advantage (IMHO) of our Class C on offroads is that the rear duals do not sink down into the existing road ruts due to it's wide rear stance ... thus providing great middle-of-the-road rock clearance for it's differential, transmission, and oil pan.