Don't worry about warranty work. Most of our repairs have been done by dealers in other states, as we were traveling. In a pinch, Camping World has gotten permission to do some of it, even though they are not a dealer for my brand of RV.
Nearly all our RV's have been purchased far from home. We are retired and we can go far distances to save money!!
Good idea to "try it out" in the dealer's parking lot overnight.
It is REALLY a good idea to video tape the walk through! There are SO many details and being your first RV, and not accustomed to what the ho-ho they are talking about, that video will be invaluable!!
Know you can hardly wait to see your family and to pick up your new RV!!
Enjoy your day.