Checking the descriptions, all widebodies bigger than B767 - A330, B747, B777 - have just 318 cm wide floor. Which means that a Tata Nano or a real Austin Mini could be placed across the plane (replacing one pair of LD3 containers) but a bigger car has to be placed along the plane. And turned at the door.
The door widths are 264 cm in 747, and 269 to 272 cm on B777, A330, A340... Finding the space to turn the car would be tricky.