I see caravans of them crossing the border into Mexico. I know a state trooper that calls them Guatemala caravans. Says a lot come out of California. Usually a box truck leads with a truck on a tow bar. The beds loaded with Toyota parts. Then a chain of running trucks towing non running trucks, also with the beds loaded with doors, hoods, fenders.....
I've seen as many as 14 all traveling together. They drive in the slow lane with signs saying "In Tow". The trooper says they have their act together. Well organized and properly secured loads. I see them quite often going from I-10 to I-19 south.