I've had two "dead in my tracks" moments. First, with a new '98 Jeep Wrangler, I hit a water bar on a graveled road and the whole jeep went dead. I had headlights, wipers, but no juice to the engine. Couldn't crank, couldn't roll start, nada. I got a little speed coasting backwards then locked the brakes cranked the wheel and spun it around nose downhill and coasted about 3/4ths of a mile 'til I came to a rise I didn't have enough momentum to coast over. From there ... I walked some miles, then, back on the more main gravel, I thumbed a ride with a passing car out to a remote store which had a pay phone. Second, with my '08 Frontier, I apparently hit something in the road punching a hole right through the center of both driver's side tires. Didn't know it for a half mile. I heard the hissing when I stopped at a stop sign at the saddle at the top of the mountain where many roads met. 2 flats, 1 spare. I'll let you imagine some of the commentary I offered. It was not fit for polite company. I jacked it up quickly setting the truck on .. either rocks or blocks of wood .. and started walking. After a ways, I managed to thumb a ride with a passing car.
The crazy thing is both times, it was <the same person> driving the passing car. Different road systems, probably 35-40 miles apart. Same person.
In the first case I got a tow truck to tow the jeep to the nearest dealership. It turned out to be a major connector in the electrical harness had not been snapped together at the factory and the bump had separated the halves. Easy fix but I was down, immobile, and missed several days of work waiting for it. In the second case, the driver dropped me at my dad's house, I took his truck up, pulled all 4 tires off my truck, and took them into town and got a new set of 4, put them on the truck on the way by, then got my dad to shuttle me back to retrieve my truck. Very lucky it was not vandalized down in that country but I didn't have a choice.
This stuff is like making something idiot proof. If you make it idiot proof, they'll upgrade the idiot. There is only so much you can do, so much you can reasonably anticipate. Probably the one "tool" that you can carry to address the most problems is a satellite phone. Take the basics ... take the things you know how to use to address the things you know how to fix. Take a sat phone. Take whatever supplies you need to survive on location 'til help arrives .. blankets, food, water, a heat source.
MIB