Question on ordering a TT (Grey Wolf 26BH)

Well, the St. Louis RV show got us! We found a TT that we like in the Grey Wolf 26BH

What about the one at the show? Can you purchase it now? Otherwise the dealer wants some assurance that you are a serious buyer and will follow through with the deal. And you are concerned that the dealer will deliver a 'just right' product. $500 is all I would consider as a deposit and on a card it can be disputed. Many RV shows will put a sign on a unit that says "Sold". And the door is locked. You take home the unit you looked at and walked through.