Originally Posted by Kamari

I got to playing around with an idea and this seems to work. The issue with the rear-facing seats is the (ever so low possibility of the) air bag deployment. Fold the seat forward and your car seat can sit on the bench with the back resting on the back of the passenger seat- safely away from the airbag. There's still space to connect your seat belt and even easier to connect to the trunk anchor.
Attachment 116350