OK, here is the update. the hole in the underbelly WAS supposed to be there. There is a drain tube there. It was just not out as far as it should have been. The hose was draining overflow water from a tank due to the way the RV was angled. So, nothing to worry about at the moment. We are relieved. the service department at the dealer explained to my satisfaction and we are ready to pick up our 36FL on Saturday and bring it home to set up and move in. YAY.
Thank you all for the comments. Nice that we have neighbors that look after each other.