"A small cessna is no more of a threat than a U-Haul."
Living in OKC, I would strongly disagree with you.
Thats my point. A U-Haul can do more damage with conventional explosive because it can carry more. If nuke, bio, or chem, it doesnt really matter between the two.
As a Texan I remember that day well too, and the yellow Ryder truck.