Tim,
I live in Southern Colorado, ride in CO, Utah, New Mexico and Arizona....
I carry a PowerTank set up and red plugs. I also carry a small can of starting fluid and strike anywhere matches.
Thus I can seat a bead, plug just about any tear or hole, and fill six tires from a $3 fill of CO2 from Sports Authority.
Sometimes I think if I was to dig far enough I'd find the kitchen sink mounted somewhere on my RZR...so no room for a spare!
Using this set up I have reseated a bead for a friend, plugged two sidewall tears cuz I was tired and stupid...but haven't had to sit and wait for help once (yet)
Pirate