I just had this conversation with one of my employees on Friday. We had to drive out to a small town in eastern Oregon for a brewery project we're working on, and the drive back was, um, close.
We started talking about "rescue" options. It seems to me that one possibility would be to rescue a dead electric vehicle (especially one that is capable of DC quick charging) would be to have a truck with a large battery pack on it, like 3 or 4 Tesla packs. You could then quick charge the dead car from those packs and get enough juice to get the car to a proper charger. This idea goes on the concept that if you connect a low charge battery to a fully charged battery, the two batteries will want to equalize their charge. This would effectively make a mobile supercharger or Chademo charger.
Of course, you wouldn't need to charge the dead car fully, just enough to get you home or to the closest charging option. Seems like an easier deal than flatbedding a dead car. Of course, such a truck would be expensive to just have sitting around, but I think in places where there are a lot of EVs, it could make sense for a roadside service provider to have something like that.