RV shows aren't there to show you EVERYTHING... they are there to show you what the dealers want to sell. I've noticed that depending upon what show you attend, they have different selections of RV's. We go to Hershey every year and they have a wide selection of a lot of things. Tiny trailers and truck campers up to half million dollar class A rigs. I go to the Dulles, VA show from time to time and they don't really show too many smaller trailers.
Each show markets to a different crowd. Personally I love all the huge trailers, because I see more and more smaller and older campgrounds having vacancies as a result! Our first trailer was a 22' non slide Nash. I could put that trailer on literally any camp spot... even a tent spot if needed. Now we have a camping friend who has a 44' quad slide 5th wheel... he can only go to limited campgrounds with that behemoth!