Next time you go, make pictures not just of the stuff you like, but make your first picture of the sign with the model name/number price and that kind of stuff... and be sure you make a picture of the yellow weight sticker. I was looking at a show a little over a year ago, and like you mentioned I was overwhelmed. The second day, I made a picture of the sign... and marked the model in the brochure and then anything else that really caught my attention. It helped to know which pictures were which trailer.
FYI, be sure and look at yellow stickers closely. when I was looking, I found a big difference between the estimated dry weights on manufacturers websites/brochures and what the sticker said the actual weight was. Often there was much less weight available for loading stuff that the estimates suggested.