After the dealer brief, you will feel like you've been hit with a fire hose full of info. No way to remember it all.
I don't know if it still there, but the FWC web site has a good checklist/brief/outline in PDF format. Print it out and take it with you.
To cover my "hit" list, which has been addressed by others for the most part...
Before driving away, double check the roof latches.
Secure the dead bolt in the door.
Make sure the table support arm is secure so it doesn't flop around and hit stuff while taking turns.
Double check roof vents closed.
While your propane tanks may be empty, get in the habit of checking the tank valves are closed. Last thing you need is to be involved an accident and have a possible propane leak.
I don't know how far you have to drive home, but, I'd check the turnbuckles 30 - 50 miles after leaving the dealer.
The REALLY important thing, ENJOY and have FUN!
CONGRATULATIONS!