All cars that Fiat produces have to go to customers, all over the world. Not only trailers, but trains and ships were used for this. Because most of us never have seen Fiat 850s transported on ships and trains, I have some images for you:

Fiat 850 op transport naar Noord Amerika (1969)
These are going to be shipped to the USA

Fiat 850 op Transportterrein in Mirafiori (1970)
These trains leave the Mirafiori factory to various importers in Europe.