Cars and Vans that work well for your question are: HHR or PT cruiser. Take out rear seat and you can store two road bikes with wheels. Any Mini Van, Chrysler has a flat floor. Honda element and even the Scion xB work OK, both are a bit homely. All full sized SUVs and many of the mid sized ones work. Ford Flex. Suburu Forrester, Honda CRV would work well in the Colorado winters.
How many bikes and how often are they with you and the vehicle?