My 2011, 2500 Ram with a Cummins is rated at 14,500. The 2013 Rams will have a higher tow rating, but it's not on there website yet. IMO I would make sure the weight of the camper is below what the weight rating on the truck is. Sure the truck will pull more then what they have it rated it at, but if you get into an accident and your over weight you could be getting big tickets and I have heard of insurance company's not covering you because your over weight.
Happy camping and safe travels
Chris & Karen- Heyworth, Illinois
pulled by a 2011 RAM
2500 CTD 4x4
PullRite Superglide 18K hitch