I definitely agree with the show is Brisneyland for a good overall view of all things camper trailer. This is how we toured many manufacturers in a short space of time.
The one thing i would suggest though is don't make a decision on the day no matter how good the show specials are. Chances are if they are good guys they will still offer the show specials for a limited time after the show has finished anyway.
Go home have a good think and compare brochures etc etc. Sleep on it, imagine yourself camping and what you will REALLY use. Some bells and whistles just add time until you can enjoy the camping experience.
The other thing is try not to judge the guys too much at the show. My wife and i saw sooo many tyre kickers getting manufacturers to open and close trailers and tents just because they wanted to have a look. I suggest have a close look and feel but once the show is over and you have a short list of what you liked the look of, visit the showrooms and talk to them one on one. Then you will get to know the real personalities behind the CT's.
I tried to talk to the manufacturer of our trailer twice at last years show but he was soo busy we didn't talk to him at all.
We then short listed our favorites, went to the showrooms and wallah, made the best decision with as much information as possible. We couldn't be happier!!!
Oh and don't trust the guys who think a good quality trailer is all about the thickness of the steel it is made of, even if they do have a well known dinosaur spruking their product
Good luck and enjoy the experience!!!