Honda Element.

Flat floor in back. You can easily bolt 2-3 side-by-side roof-type for mount racks. 20+ mph.

This crazy Italian guy (actually he's not that crazy), who has about 10 bikes and rides everyday has an entire bike shop, including compressors and power tools, and two bikes, mounted easily inside the back of his element.

And if UPS every sponsors a bike team, you can paint it brown and join the fun.

I have a Forester, and it's a great car, but you can't realy transport bikes intact inside the rear, which I glean you are looking for.