Two things will happen, it's inevitable! 1) You will pack things you will not use and wonder why you brought it along once you get home. 2) You will fail to pack something you really wished you had! It WILL happen. It takes about .... what ???? 30 years of camping to finally figure out what you really need and things you don't need???
So, don't be too miffed if you forget something you wish you had. With that said, make sure you have located 2 things near your destination point. The first is a local dealer with an RV repair shop you can scream for "help" if something happens and you find yourself in over your head. The second is a good accessible Wall Mart to purchase those items you absolutely MUST have and you forgot.
As suggested above, if you can do a couple driveway camps, this will help you figure out these 2 things and avoid frustration once you're on the road.
This is true for any first time RV owner regardless of what type of RV anyone purchases.
Edit: Even if you purchase a tent, you always set it up in the back yard first to make sure all the parts are there and you understand how it is set up so there are no surprises once you reach your campsite.
