on ram builder posted in this thread, where you see Base Weights/GCW/Payload/Trailer Towing charts, the next line down is camper guide.
on page 11 of the camper guide you will see this. the last 2 are 14,400 GVW trucks which are dual rear wheel trucks.
I think the weight rating of your rear tires will be your limit
my wolf creak was real close to my limits on my 06, than I added 500 lbs tong weight for my horse (2 wheel verity) trailer and I was over my tire weight limit. but your new truck should be higher (and heaver) than my 06 was.
edit: wondering if it came with a slip of paper in glovebox that shows slide-in camper capacities?
