Many reasons why throwing a bike on it's side isn't optimal - it wastes a lot of the floor space, the bike slides around, no room for other gear except fitting it around the bike, can't put things on it, etc.

I spent a lot of time looking at this a few years ago as I wanted to travel with bike inside and not worry when car parked and doing other things, in bad weather, etc. I ride a 54cm roadbike.

At the time I looked at Outback, Volvo wagon.. both a no go.. the Forester as I recall was tight.. Rav4 or CRV were best, the VW Tiguan would also work but a bit tight on length.