On our recent day trip down the Rhone we saw several barges and nearly all had cars on board; ranging from modest saloons (i.e. the modern day equivilent of the Panda) to a Mercedes saloon.
A Mercedes coupe on a barge
Two cars on a barge!
The most spectacular car on boat example, however, wasn't on a large boat but on a small British registered boat - the Sarah Ann. She was making her way upstream past Avignon with a small British registered car on board. Getting the car on and off must be fun. What a great sight!
Sarah Ann and its small saloon