I have had some RV and automobile sales people attempt to pull some really slimey tactics on me while trying to negotiate a deal. I am not the most astute person in the world , but I figured out pretty quick what was going on they lost my business. I am not naive enough to think all sales people are liars, but they are definitely out there.
My most recent purchase of an RV was from a dealer 2 hours from me because they were the closest one with the model we wanted. I must say I have never had a more pleasurable buying experience and the folks there were top notch. They made us seem like old friends from the get go.