This is exactly how we do trips! We use these clothes wire storage bins which fit right in our upper cabinets. When we move around during the trip (e.g. hotel, friends' house etc.) we just take out the bin and voila, mini suitcase!
I would think it would be especially nice to be able to remove the entire container in layouts where they are over fixed rear bed. Seems like there are some pros and cons to using bins vs hanging the bags. Nothing to say you couldn't incorporate both styles. Depending on orientation of bed there seems to be a lot of options to choose that would optimise accessibility and reduce chances for of bumping heads on hard objects.