Well, if you’re seriously considering this trek, I’d suggest that you start viewing the forums where people who have actually completed this trip have posted their experiences. Besides the couple living full time in the Hell’s Half Acre fire tower, the other fire towers are manned during the day. So along the route you will have access to people with knowledge. July, August and September are the peak months and traffic is heaviest. People have reported camp sites full (they usually only have 6-12 spaces) and comraderys are formed along the way and you’re likely to camp with strangers whom you then become acquainted with, if you’re traveling in opposite directions you share info about what you’ve just been through. Traveling in the same direction people have hooked up before. Some have reported forging long term friendships and getting together again on other adventures.
It’s unlikely that one finds themselves in dire straights alone. But not impossible. People have reported giving others fuel and supplies and receiving fuel and supplies from others.
Planning and sound prep is the key. But of course there’s always the potential for unexpected eventualities. That all adds up to part of the anticipation and lure of such a trek. That’s where mopar and I got on different pages. He believed that too much preparation spoiled the enjoyment of such an adventure, and I did (do) not.