And NADA pricing or anything else that is "benchmark" is only that, a generalization. Doesn't matter if the product is Trailers and Motorhomes, cars and trucks, or even refrigerators. If you aren't happy with the price of something then you need to walk away. Otherwise you need to grit your teeth and accept the flim-flam you feel you might be getting a the cost of doing business. I once purchased a used car from a lot and saw that they added some ridiculous fee for "dealer prep" after the negotiated price was agreed on. I wasn't brave enough to challenge it and ate the expense. Was I wrong? Sure. Did I get taken? Sure. But I didn't walk away either so I deserved the treatment as unfair as it seemed to be.
When we purchase anything we tend to forget that nobody is holding a gun to our heads forcing the transaction. The only "gun" is our emotions that too often control out common sense.