That wouldn't be all that bad. Is the back seat split so that you only might have to fold down one side? I would be very curious to know that diagonal dimension OR a straight line from the hatch to the radio. I suppose I could go to the dealer with the tape measure and start taking dimensions.You'll almost definitely have to fold down the seats. There may be enough room to fit them diagonally across the back seats/trunk area, but you might also be able to stow them up the middle between the front seats.