Remember that the "market" is where a willing buyer and a willing seller meet.
Determine the price you want to pay, and of course it may vary with thrown in extras, but if you can't get that price, walk away since you're not in the market at a higher price.
If you are happy with YOUR unit and you were willing to pay the price, it doesn't matter whether you got X% off the MSRP or not...you made the deal you're happy with.
How much you enjoy the RV and the times in it isn't (or at least shouldn't be) affected by whether you can brag on an internet forum about how much you got off of MSRP.