My experiences when buying new, was everything supplied, ready to camp. A new battery, full propane tanks, the infamous starter kit (hoses, toilet paper, hocky puck adapter, and a few other items) mostly junk, but useable.
I was also offered a one time discount on most accessories in their store. One thing to keep in mind, the purchaser ultimately pays for any freebies, or items thrown in to close the deal. Often times this includes a free hitch, which will likely be a low end model. In this case, I'd try to upgrade to better quality, even if I have to pay the difference.
Jerry