We bought a Grand Design Solitude in June. Grand Design is a new manufacturer and I believe they are selling a little lower than other compatible models trying to get a foot hold in the market place. With that said our dealer didn't have a printed out MSRP for us to deduct from, just a dealer "sale price". Also we had a motor home to trade-in. Not all 5th wheel dealers sell MH's, so we eliminated a "middle man/broker" in the deal. We feel we got a fair deal on the swap and we know the dealer made a lot between the two rigs. Dealers have to make money to be there next time or for service. What's equally important is the service dept. I would rather pay a little more and get good service after the sale than to get a deal and the rig sits in the service parking lot for 3 months because of this or that. I realize that you don't want to be called a "sucker" after you leave - nobody does, but look at the big picture when deciding what is fair.
Hope this helps.