I would imagine one could fit a body into the boot of any car, if one was so minded, and it is easy enough to put the back seats down.
However, the story about VT going to ASDA with Joanna's body in his car boot has always seemed ridiculous to me, whether he said he did so or not.
Yes... but he never mentions putting the seats of the car down to have room to put the body in the car...
EDIT:......
He then went to get his car, placed the body in the boot of his car, went to Asda,
Defence Counsel: After you put the body in the boot of your car, what did you do next?
Defence Counsel: Then what did you do?
Tabak: I went back to my flat.
Defence Counsel: Then what did you do?
Tabak: I put the body into the car.
Defence Counsel: Was it easy to put the body into the car?
Tabak: No.
At No point is it explained that the car seats needed to be moved to fit a body inside this car.... Nothing is mentioned how small the boot of the car is...
The defence themselves cuts that information out by asking Dr Vincent Tabak what he did after putting the body in the boot of the car...
Defence Counsel: How many attempts did you make at placing the body into the boot of
the car?
Tabak: I think two.
Defence Counsel: Then when you put the body into the boot of your car, what did you do?
Tabak: I went into the car.
He doesn't come back with why was it difficult to put the body in the car after Dr Vincent Tabak says NO...
Which makes everyone accept that Dr Vincent Tabak just popped someone he was supposed to have murdered straight into the boot of a car with no luggage capacity!!! HOW???
http://www.criminal-lawyer.org.uk/39-CLN-JAN-2012.pdf