Nothing against sales people, we can't live without them. That said, I have never had a good experience with an rv salesman. In some cases, the dealer handles too much product and the saleman can't learn it all. OTH, I have rarely walked into an rv dealership to find all the salesmen busy at the same time, in fact never (and I visit dealerships all the time when I am in the U.S.).
So if I were a salesman, instead of moving my gob, I might consider sitting in a new rv with manual in hand and do some reading so that when a customer comes in the salesperson doesn't have to invent answers.
There is nothing more embarrassing than to hear something out of a salesman's mouth that is pure bull hockey, and I know the answer. In fact, in the last few years I have gotten smarter and at the beginning of the conversation I ask some very basic questions. If it looks like he is pulling my leg and doesn't know the product I'll walk.
And if you think this isn't true, I have a video tape of the salesman who attempted to do my PDI on a Trailmanor we bought in 2000. He sold it to me and told me from the beginning "oh it is so easy to open and setup, closing it is even easier. It's truly a piece of engineering". He was right, and his words were very true. However, when I arrived for the PDI they didn't have time to open it. I stood back and watched. I thought he was going to break the damn thing. I finally told him to "stand back" and I'd show him how to do it. What a disappointment. Afterall, all I did was watch a five minute video a couple of times. Same video still appears on Youtube.