We go to all the RV shows in our area including neighboring states and never encountered a show price that was lower than pricing from the dealer's lot. I get a kick out of the RV show salespeople stating that their show price is unbeatable only to find the very same rig on their website many months later unsold.
Most sales that occur at RV shows are due to impulse buying from those overwhelmed by something they may have never seen before or thought was unique. We go to simply look around and see if any thing catches our eye, our rig is seven years old and we still haven't seen much difference in their current models worth dropping money for.