I bet someplace in the sales contract there will be a phrase that says the dealer is not responsible for anything the salesman says. So get any promise, no matter how minor, in writing. Then there is the idea that the dealer is far away in another state. If you have a conflict of opinion after the sale you will probably have to take action in the dealer's state. If it is a new RV, why can't a dealer in NJ sell it? How about a call to the manufacturer? Will there be a problem licensing the RV in NJ? Just things to think about.
Happy Trails.