If you find a unit you REALLY like, ask the dealership if they will hold that price for you until after the show is over. Have them write it down so you have it and can vouch that was the price. After the show go back to the dealership and see if they will give you a better offer.
Meanwhile, you check with another competitor dealership for the same identical unit and see if they can match the price or do better.
If the dealership represented at the RV show is really being upfront, they'll hold the "show" price for you till after the show. And by comparing with another dealership, you'll have something to compare, and you may decide the other dealership has the better offer.
This is, IF you are going with the intention of actually buying something. Don't be a compulsive buyer when you are standing in front of all the dazzling sparkle.
Now, if your intention is to just go and have a good time, well.... hold to your guns. You're not purchasing anything, you are there ONLY on a fact finding mission. Still, if you find something you REALLY like, have the dealer write the show price down and then come back after the show is over where and when you've had time to slow your emotions down a little and realistically use your head!