I have a '95 Class C with duals. Was thinking about how far the tire tech had to crawl under to reach the axle with his long pneumatic / hydraulic axle jack when I got TireMan extenders installed.
I have a spare but would tend to call roadside assistance; that's what I have insurance for. The thought of being under a 7 ton vehicle with a bottle jack is pretty scary.
On the other hand I go way off the beaten track and need to be prepared for anything.
I use TireTrakers to give early warning of air leaks. They are not cheap and almost comically inaccurate compared to Tekton 5941 and SKS Air Checker gauges (which are always within 0.5 lbs of each other) but they give early warning.
First thing I would do is use my big can of fix-a-flat and see if that can get me back to a civilization.
Then I would try to reach roadside service.
But I go way out of cell range, so as a final option I am still thinking about a bottle jack but only with an "axle pad" that I just discovered in some web searching:
Bottle jack axle padLike it says "The pad has 12X the surface area of the jack ram alone." That's good but the fact is you are under the vehicle unless a pneumatic / hydraulic (air motor running a pump) type jack is used.
From what I can find, it looks like these require about 7 CFM to operate so there is no way a small compressor is going to work.