What's their payload? I had a '65 Piper Cherokee 180 that could carry about 750 lbs not including 50 gal of fuel. Seems like 500 or so lbs of plastic explosive would make quite a bang.
Seems like 500 is about right. How much could you stuff in the Olds? That is why I brought that point up. How about a Dodge 3500 dually with a camper top? 20K lbs???? Which one can travel under a TFR without notice?
Since you own an airplane, you know as well as anyone that anything with wings is easily sensationalized, and makes a great whipping boy for the media.
Not to mention, most cars now days are actually faster than the 150 (105kts ias).
IIRC it has a useful load of about 500lb, including ~150lb of fuel. With pilot, full fuel and no pax you could have a payload of 100lb or so.
The useful load of a 150 is 615#, and empty wt is 985 #. Fuel capacity is 26 gal. Two seats, and a little room in the back for a quart of oil and a towbar.