Salesmen in this industry are not the greatest group as a whole. I have come across many bad people, but not all are bad...
I bought some hub caps for motorhome. The front ones were a smaller size, just slightly. I took them back ,but salesman insisted they were correct. He said the front (which were the wrong ones) had to fit tighter because they take more abuse. He literally held his fist out and flexed and shook as if he were the front axle of a made-up RV taking a beating, "they take more impact".
I told him, no, there is no such thing, but he was very insistent that they were correct and to leave and either use them or not, but not to return them. I did return them.
Another salesman (parts guy) flat out told me it was not worth his time to sell me a spark plug for my Onan because he makes more selling campers than parts and that he could not help me. That lot went out of business not too long after.
Salesman are what is left of the classic used-car lot salesman. I have been lied to a lot in RV dealerships. A lot of times they just do not know anything about RVs, and have to lie, feel they have to lie, so that you have more confidence buying from them. They never camp, do not own RVs and during the peak camping season they cannot take vacations bc that is peak sales months. In general - does not apply to every one out there, for those who will nit-pick...
It's part of the industry, so BUYER-BEWARE!