Both the 2003^W1993 attack on the WTC and the Oklahoma City bombing attacks were delivered via truck. It's practically the only way to deliver a big explosive device.

Small correction, the bomb attack on WTC was 1993.

Ahmed Ressam's 2000 plot to bomb LAX involved transporting large amounts of explosives across the US border from Canada by car.

Why the hell is this being downvoted? http://en.wikipedia.org/wiki/Ahmed_Ressam#Plot_to_bomb_LAX

The only reason they weren't caught was because of the lack of back scatter vans, right?

Hah. Don't like that, huh?

The question was, "How often do we have vehicle bombs in the US?"

What do backscatter vans have to do with this? Want to know my position? Fine: I'm against the arbitrary deployment of rolling scanners.

Don't put words in my mouth. If you want to be snarky, you had better be willing to get it back.

In the past the US had major issues with car bombs. For instance in 1976 the Cleveland area had 37 car bombs. http://www.cleveland.com/moviebuff/index.ssf/2011/03/welcome...

To people in Oklahoma City... at least once too many times.

Agreed! We should ban all cars and trucks from civilian usage since they can carry bombs

This is exactly how civil liberties are slowly eroded away.