Snatch strap query

[BillsGU]

The tie down may come in handy if the vehicle needs to be trucked or ferried another time in its life.

I have seen a number of vehicles tied down on tow trucks and trains. The ones I have seen are always tied down by straps over the wheels. I can't remember any that used the factory tie downs. What do they do on the ferry to Tassie if it gets rough?