Done it four times now,
Scooter hired
Own scooter
Fiat 500 hired
Smart car hired
It’s an amazing route but I’m not taking a van there!
I loved doing it on the scooters but the third and fourth time were in winter and it was 5 degrees so hired the car,
You don’t drive down this road without seeing an accident,
My advice is hire a scooter or the smallest car you can squeeze into as even in winter there are traffic jambs and it’s easier to get by in something small, enjoy your trip