But hexane is quite volatile so you can get a vapour mix fairly easily.
I have done this demo using methylated spirits by shaking the can before lighting and you get a nice boom.
Getting a whole truckload to be stable for most of the journey and then to mix enough to go boom on the bridge is not in within the expertise of this chemistry teacher but I can see it might be possible.
Interesting point about Hexogen, but would be harder to hide it.
21 tons of hexane were placed in layers of packaging film that were transported by the truck - SBU disclosed the details of the first detonation of the Crimean Bridge on October 8, 2022. (files.catbox.moe)
https://files.catbox.moe/jc947i.jpg...