What is it called to have seating in a trunk?

Question

I am wondering about the "official" name of trunk seating in a car? Like in some wagon style cars, there is a bench seat in the trunk that can fit two extra people. (I am selling a car, so wondering what to call it.) Thank you!

Answer 1

Well in older cars like the 1930's it was called a jumpseat

Answer 2

rumble  seat

Answer 3

Perhaps it is called a rumble seat?