Best to go in with knowledge check internet pricing, including ebay, "wholesale RV" places, with that knowledge realize your shipping to your dealer will probably be more........... but if you can get close you are doing good.........
Last summer we ordered our TH our little VA dealer adds a % period take it or not, they were the best deal MSRP of 42K was 29K (only add on was taxes & tags) the NC dealer set their price but wouldn't match...........
That reminds me Country Roads RV in NC has Ok prices but a great web site....