First Off - Congrats on your new rig. Next up - here is a link to a PDI web page with lots of info. There are a number of them on this forum as well. Plan on going early and staying late. Once the deal is done and you drive away - your leverage is riding right along with you. Some folks make a deal with their dealer to stay at the dealership for a night or two - build a list of "stuff" that needs fixing. In any event, enjoy the new rig.
Here is the link:
RV Inspection Checklist