For you DIY tire changers out there (of which I'm maybe one, if ever required in certain situations):
1. Sometimes "along side" the road is soft, so in addition to all the tire changing equipment you might have along, you better have some boards (and shovel) along to create a proper support area for the jack's base.
2. You might want to not have just a regular high-tonnage hydraulic jack along - the better high-tonnage jack is one that extends higher just in case. i.e. A jack with dual cylinder capability so as to extend more than normal. i.e. What if the road shoulder is slanted downwards from the roadway, and the flat is on the side away from the roadway and you have/want to get the RV axle with the flat somewhat level?
3. If your spare is mounted up underneath like they are on pickup trucks (and is the case on our RV) ... even though you might be able to drop, drag, and mount the spare - where are you going lift up and store the flat tire if you can't lift it back up and secure it underneath?
4. Don't forget you may have to do tire changing in extreme heat, cold, rain, snow, sleet, high wind conditions, etc.. You might want to carry along a tarp, suitable clothing, and a portable fan to blow on you if you're doing tire changing work in the extreme heat.
5. If - worst case - you think you can merely "camp out" while waiting for roadside service to arrive and change your spare -> what if you're on a highly tipped/rough area just off the roadway. Will the RV be at too much of an angle to not damage your propane refrigerator and/or ruin food inside while you wait hours and hours for help?
Of course if you're a boondock camper, you better be able to change your RV's tire in all kinds of strange situations. For this we carry along a satellite communication device ... but I hope my budget can afford to have $$$$$ trailside service come out to rescue us!