IRAN fires off Shahab III Missiles; Prelude to War?

I just read the report on Drudge; it looks like iran now has a fairly capable surface-Surface missile system.
My questions:
is the SHAHAB capable of carrying a nuclear warhead?
-is this missile capable of being launched from the back of a truck?
finally, how are the Isarealis likely to react? Is their anti-missile system capanle of destroying the shahab?

shahab-3 Shahab-3
shahab-4 Shahab-4
shahab-5 http://www.missilethreat.com/missilesoftheworld/id.109/missile_detail.asp
shahab-6 http://www.missilethreat.com/missilesoftheworld/id.110/missile_detail.asp

Not too Shahabby.

My initial feeling was that Iran was simply trying to get some fear back into the oil market. Oil prices have fallen over the past few days and the extreme run up may be running out of steam.

You get the impression the world is on the brink for no real reason at all?

Israel says they 'will not tolerate" a nuclear Iran.
Iran says they will close the Arabian Gulf and hit Tel Aviv if attacked.
The Americans say they will defend Israel.
The Russians say if the Americans build a radar in eastern Europe they will take military steps.

Probably nothing much will come of this, but if it does hindsight will be 20/20 that we should have seen it coming.