When I found my first coach had the same experience. Spent four hours alone in, on and under the rig checking everything by myself. When I asked for a test drive they handed me the keys and said have fun. I did my home work and knew what rigs of similar lay out and chassis was selling at or sold. Set my budget limit and after looking at the coach I had an idea of post sale work that would be required. Made an offer, dealer countered, we countered and the dealer agreed. Told them I wanted the exterior washed and I'll be back next weekend to pick it up.
You need to do your homework to determine a reasonable price to offer. Dealers need to make a reasonable profit to stay in business but if they missed price a trade in or an auction purchase I won't make up for their mistake. Research the market for the class you are looking at, set your wants and needs, inspect the coach, stay within your budget and be ready to walk away if necessary.