I am looking for a bike rack for my station wagon for 4 bikes: 2 kid, 2 adult (hybrid type). I guess the hitch type is more economical than the roof type? Any faves: Yakima vs. Thule vs. other? Upsides, downsides of roof (have to lift up, better to protect frames) v hitch-type (vulnerable to rear ending)? Particular features that are convenient or to avoid? Any other relevant comments appreciated, and feel free to provide links to any previous thread, pictures, etc. Thank you.