Should remind a lot of us of interesting similar experiences. I particularly appreciated the way you discribed the way the delivery and explanation was done under the rain. We lived through a pretty similar experience when we took delivery of our RV, on top of it, it was at night time and the tech was gone leaving the sales person to do the delivery, and he didn't even know how to keept the water in the fresh water tank (the drain was open, so everything was simply going under the coach).
I think everyone should watch the film RV before purchasing one. Even if exagerated, this is an interesting eye opener.