Cub Scout Leaders?!
WOW! You deserve a medal for that hazardous duty.
That is a very nice looking rig you've gotten into.
PDI is Pre Delivery Inspection. This time is yours, don't let the dealer cut you short on time. Ask everything (and I do mean EVERYTHING!) you don't know, understand, or want clarified. Some folks even video it on their phones because you will be inundated with information, much of which may not make sense at the time or go in one ear and out the other because you're trying to take it all in.
Make sure they tell you, better yet show you, how to retract the slides and stabilizer jacks manually -- just in case -- and where are the tools to do that stored.
As it may have been mentioned, DON'T sign any papers, delivery, etc until you are satisfied with the PDI and understand it.
You're going to have a BLAST! Go out and enjoy your adventures.