I did it just fine in a Fiat Panda, for instance 3 adults, 2 French bulldogs and luggage for 2 weeks, 6 hour drive. Going home, we added a cat, its transport b

I did it just fine in a Fiat Panda, for instance 3 adults, 2 French bulldogs and luggage for 2 weeks, 6 hour drive. Going home, we added a cat, its transport box and toys/accessories/food. Not a problem. In the Peugeot 406 (midsize sedan) I had after that, we were 5 adults going to weight lifting competitions, so you can probably guess that none of us were exactly tiny. Also not a problem.