I've read a couple times about mobile or temporary Superchargers - they have both pedestals and the charger attached on a structure, so it can be moved from place to place (but presumably not functional until hooked to wiring in a given place.) The car that burned in Norway last year was plugged in to one of those.
In this case, however, I think you're reading too much into the comment. They said it was for roadside assistance use - which I'm thinking means if a Tesla runs out of juice somewhere nearby, it gets trucked there and fed enough to get back on to the network.