I have google earth'd the entire route and while I have never seen a Conex type facility, I dont see why they cant be used. Sure the barges wont be designed for them and ports wont necessarily have cranes to pick them up to start with.
It will however limit the barges carrying capacity thats for sure. One MAYBE two high is all you'll get an be assured of no issues moving downstream.
Now moving into the Great Lakes, thats another thing all together. The saint Lawrence and Canada are two much larger issues I think.
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TheDarkProphet
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