Tesla's emergency advice to drivers (right hand side of
http://teslamotors.com/firstresponders) says:
So Tesla obviously expect to be involved after an accident.
This caused me to look up the terms of my existing roadside cover (AA in the UK) and I found this also has an exclusion:
But then they also say:
In both cases, I suspect that the reasoning is that there's no reason why they should cover the cost of the tow when there's no advantage to them or to their customer, since the tow would be covered by the insurance of whichever party is paying for the accident.
It does seem poor that Tesla didn't offer to organize a tow at the driver's expense - perhaps they would have done so if asked.