I will echo the suggestion of the Saris Bones. I actually have a hitch receiver and a pretty good rack to go on it but I use the Saris even on that vehicle. It's just easier to deal with in some ways. Also the Saris can be put onto any car, even a friend's car. It'll fit on pretty much anything with no changes to the vehicle.
I occasionally use the hitch rack but it only works on the car that has the receiver installed, and it's big and clumsy and makes it harder to get into the back of the car even when the bikes are not loaded. The Saris you can ignore and still open the back when the bikes are not loaded, and you can still get in with the bikes loaded though you do have to lift the weight.
The downside to the Saris is that getting multiple bikes on and off takes some time, but I am generally not taking them on and off a lot so 5 minutes to get the bikes on or off isn't a big deal.
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Work: the 8 hours that separates bike rides.