I doubt you’ll find a dealer or a show with a broad selection, maybe 4 or 5 units max. Best bet is to see what you can see to decide if you dig the concept and then hunt for the size & floorplan you think you’d like.
Or, check out
www.tmtrailblazers.org and see if there’s a rally near you. They won’t be brand new models but you could probably get a look at a bunch of different styles and most owners are more than happy to talk about their camper.