The easy to take out is a good point. Way I always had to pack bikes in cars meant loads of swearing and bending so a quick in between ride was impossible.
I vote for caddy. Or the really cool slightly bigger Opel combo and whatever it's called from other brands.
Different layouts are possible- I know I can get these bags in a small Vauxhall when they are piled on top of each other.
But there’s likely to be other stuff and this arrangement means I can easily get bags out individually rather than pull everything out each time.