Those big Diesel Pushers have such heavy tires/wheels, and require so much lug and nut torque, let alone the jack to lift that coach, that most owners can't change a flat even if they have a spare. Same as the 18-wheelers. ON EDIT: Seems an unmounted spare would work well for those. I think road service can dismount/mount tires at the roadside.
Class C? Our first one had a spare and I carried jack, blocks, wrench. Needed it after a blowout. The C we have now came with one that was never used in 15 years. Not in first owner's 30,000 miles or our 10,000 so far. We just got new tires and we bought seven to have a new spare.
So, I have mounted spare and everything needed to change it. I hope 1. It'll never happen, 2. Somebody else will change it, 3. Somebody will come to change it but needs the jack or socket or whatever they forgot but I have, 4. Somebody'll help me change it. Finally, 5. I'll remember how to change it safely and be thankful I was equipped to do it.
Carry at least a Tire, hopefully Mounted, and Wrench(es) needed to change it. to get the Wheel Simulators off first too...