All of my back seat goes down. The issue is that has it is a saloon, the plane has to go over the boot lip then under the back window. Anything larger than 40 size gets to be a problem:

CG Chipmunk is ok as the u/c is on the wing.
CG Ultimate I had to take the u/c off as well as the wings [&:]
C140 stab comes off, goes in on its side. If it didn't have plug in wings I would have been in trouble.[X(]