Some additional info I found:
As of May 2nd, the New York Post reported that the New Jersey tanker had not yet been found. The same story also notes:
Tanker trucks are common tools of the global terrorist trade:
In 1996, a tanker truck loaded with at least 5,000 pounds of plastic explosives barreled through the Khobar Towers residential complex in Dhahran, Saudi Arabia, killing 19 American servicemen.
In April 2002, a gas tanker truck crashed into a Tunisian synagogue, killing 21 people.
In May 2002, a remote-controlled bomb was used to blow up a fuel tanker at Israel's largest fuel depot in Tel Aviv.
Last May, chemical and fuel-laden trucks were used in three simultaneous terrorist attacks on housing complexes in Saudi Arabia; the blasts killed 35 people, including eight Americans.
Last summer, the Philippines arrested its most wanted Islamic terrorist, Saifullah (Muklis) Yunos, who confessed to plotting an extensive bombing campaign that included filling an empty gas tanker with ammonium nitrate and sawdust and detonating it in front of the presidential residence in Manila.
http://www.command-post.org/gwot/2_archives/012621.html
This is really frightening. The first think I though of...how many truckers just 'pull over' and sleep at rest stops over night. What protection do they have if someone wants to take their truck? Will drivers have to start driving with a partner so that one can always be awake/alert...think of what that would do to the economy with the added costs carried by consumers.