Just about any vehicle driven by someone who doesn't know what they're doing. In Yellowstone it was the sedan drivers who rented an RV for vacation -- only 3X as long, and 50% wider, that what they knew how to drive. Around home, it's the people who learned to drive a Chevette 30 years ago; since they know how to drive, no need to re-learn driving a full size pickup or monster SUV.