I suppose I've read "The Stand" too many times. :)
http://www.freerepublic.com/focus/f-news/1185871/posts
DHS/FBI ALERT
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DETAILS
There is no standard type of vehicle associated with VBIEDs. Terrorists appear to select vehicles based on an assessment of vehicles common to and available in a region, vehicles possessing routine access to the target area or the security posture of the intended target. Vehicles of any type or size can be utilized in vehicle bombings, although the size of the explosive charge may, to some degree, dictate the size of the vehicle required. In the 1993 World Trade Center attack, approximately 1,200 pounds of improvised explosives were placed in a rental van which had been reported stolen by one of the conspirators. Other large vehiclessuch as limousinesshould also receive consideration as potential VBIEDs, since limousines have larger storage capacity than regular passenger vehicles. In addition, limousines often convey an impression of authority or prestige, which may facilitate their access to specific locations in a building or facility denied to the general public.
Analysis of terrorist preparations for past attacks overseas and in the United States suggests that preoperational indicators may be present in the days or weeks prior to an attack. The following indicators may point to possible planning to use rental vehicles in a terrorist attack. Alone, each indicator can result from legitimate commercial activity or criminal activity not related to terrorism; however, multiple indicators can suggest a terrorist threat.
Customers who attempt to give vague or unverifiable references or employment information on rental agreements, who insist on paying in cash and/or who seem overly concerned about privacy.
Attempts to expedite collection of deposits made on rental vehicles reported as "stolen."
Suspicious inquiries concerning whether vehicles can be modified to handle heavier loads, create additional storage areas or increase fuel capacity or vehicle speed.
Suspicious inquiries concerning the use of limousines by private drivers or a limousines exact length, height or interior volume.
Reports of rental vehicles parked for prolonged periods of time near sensitive facilities such as government, military, utility or other high profile sites.
Suspicious attempts to gain employment at vehicle dealerships and/or rental agencies.
Customers displaying burns or chemical exposure symptoms who provide vague or illogical explanations as to the circumstances surrounding the injuries.
Returned rental vehicles with altered company logos, Department of Transportation numbers, or structural or appearance modifications.
Tis my favorite free rental -g-