I can't imagine that in the slightest.
If it is actually a worry, then I guess we gun owners really ARE violent nuts about to crack and should turn our guns in.
Seriously, I can't imagine any law abiding gun owner even beginning to think that hijacking a freight truck for ammo being anywhere close to something that sounds like a good idea.
And that's even before thinking over the feasibility of the plan itself. The drought will end. Maybe not as soon as we'd like, but it ended before.