I've ridden in "cattle cars". In 1962, my dad was stationed at Gitmo. We dependants were delivered to the docks in them, when we were evacuated on one of their "cruise ships", the USNS Upshur.
Come to think of it I'm sure you could get a bunch of truckers to do it free of charge. I don't think using trucks is a bad thing. I am sure driving in a semi is alot more comfortable than under the seat or in the trunk of a car.
I've ridden in "cattle cars". In 1962, my dad was stationed at Gitmo. We dependants were delivered to the docks in them, when we were evacuated on one of their "cruise ships", the USNS Upshur.