Mac & JC,
If you haven't already done so, check out the Sprinter Forum at: Sprinter - Sprinter-Forum
The folks there are very knowledgeable about all aspects of Sprinters and are very helpful. Be sure you mention the model year of your Sprinter; the chassis not the Airstream model year.
Also, if it isn't already taken care of for you by the dealer, make sure you get the warranty start date reset to the date of purchase from the AS dealer.
Welcome to the Air forum and good luck with your Interstate.