[ahadams2]

actually a number of years ago the IRA used dumptrucks which appeared to be full of sand to launch artillery type rockets at a few places: the rockets and associated timing and ignition gear were embedded in the sand at a precalculated angle so all the driver had to do was park in the right place, facing the right direction, and then get out of there before the timer started the rocket's ignition sequence.

then of course, if one considers tamping and ballast, one could also place a large quantity of explosive with appropriate detonators and so forth on the bed of a dumptruck and use metal or plywood sheets to cover it such that the sand on top of it all would ac as tamping to focus the blast in a particular direction...

oh yes, all sorts of interesting things one can do with dumptrucks....

[Cold Heat]

I am sure that a imaginative person could utilize a dump truck for more than dumping.

The prime threat we face here in the U.S. would not be so bold as artillery or mortars.

It would be more likely a truck or car bomb utilizing nitrates for the bang.

Think U-haul.

They would not need to return the keys so why steal a marked county open bed dumper unless they needed engine parts or what may have been in the truck.(sand?)

My quess is that hundreds of trucks have been ripped off during the same time period.

I think this is likely a false alarm.