This issue seems to have fallen asleep, although there have been a few reports on the problems in Pakistan with moving supplies by truck and IIRC comments on the implications for any "surge" in relying on Karachi port and the overland routes.

The link is a report on an attack on fuel tankers in Afghanistan outside Jalalabad, which has "lessons learned" :
http://freerangeinternational.com/blog/?p=2344

I note the convoy had an escort from a PSC Blue Compass:
http://www.compass-iss.com/index.html

davidbfpo