Most innovations in travel trailer design are actually reflections on the past, such as the Airstream and the Shasta Airflyte. We can’t remember the last time we saw a genuine leap forward, so our hearts leapt when we spotted the Mehrzeller caravan concept.Mehrzeller means “multi cell” and it’s building a buzz at the giant Caravan Salon Düsseldorf, Europe’s biggest RV show. This particular travel trailer is the creation of Christian Freissling and Theresa Kalteis, two designers from Graz University of Technology in Austria, and they’ve got backing from some of the biggest names in European industry.More details are on the new RV design blog, squob.com.