Makes me sick too....
I think 400ish hives will fit on a tractor trailer, so 300 would not have been a full load.
It would take a LOT of grit to pull in somewhere with a truck and start loading hives.. That was not done in two or three minutes and took a loader of some type to get it done, so it was even more than one truck. At least a tractor trailer and another truck/trailer with the loader.
Most of my hives are not easily accessible by anything more than a truck and small trailer. Some of them you could not get a trailer to, but I do often worry that they may vanish. I hope they catch the people that did this... String them up naked, rub them with bannana peels and kick over a couple mean hives beside them.