Do you carry a spare tire for your Class C?

Yes, I carry have carried a spare wheel since 2008 and never used it. I bought a new one with the last set of new tires. I did practise putting it on the front but have never tested myself changing a rear one. We often travel and camp in remote areas.

The spare has been mounted on the bumper. When I got a hitch installed I asked for it to be welded to the bumper to increase the support for the spare.

I've needed a spare on other vehicles a few times in my life, most notably while driving to Yellowknife. Twice had a blowout on our popup. The second time both wheels were dead (at Lake Louise), resulting in a trip to Calgary and back with new wheels. The simultaneous failures were probably due to a tire shop selling me tires with insufficient weight rating.

The rear bumper may not be the best choice,although some RVs have them.
Mine is mounted inside my large rear storage compartment,bolted to a frame that is welded to the frame rails.

Another way to go is mounting the spare using the receiver.

Here are some examples

Or you can mount it underneath

Like Baja Man did

Absolutely. For me a spare is a must!

My 2014 RV did not come with a spare. I went through the hassle of finding the correct wheel rim and tire, had it mounted, and store it in my exterior storage bay. I just don't want to deal with what would ensue if I called for roadside assistance without one.
Does every RV roadside assistance service provider come prepared to remove the old tire from the rim and remount a new tire? How can they be prepared with the correct tire? I know whatever they do it ends up costing a bundle.

if you have a roof rack, buy a spare tire no rim, have a vinyl bag made for it, and your good, most times it takes a lot of muscle to get the nuts off. let a pro do it, and most places won,t have a tire ready to go. if they do it,ll cost a bunch.

I don't have access to look right now, but it is a 2017 Ford E-450 chassis.

Is your tire size a common one? (mine is 16.5 so is hard to find in stock). If it is, then not having a spare isn't as important.

However, having the jack and lug wrench is always a good idea. The jack can be used for other problems, and you might have to remove the tire to access the brakes, etc.