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From the brochure: "Trailer kingpin weight should be 15 to 25 percent of total loaded trailer weight (up to 1500 lbs on 1500 models, up to 2500 lbs on 1500HD models, up to 3000 lbs on 2500HD models, and up to 3500 lbs on 3500 models). Addition of trailer tongue weights/kingpin weight cannot cause vehicle weights to exceed Rear Gross Axle Weight Rating (RFAWR) or Gross Vehicle Weight Rating (GVWR).. These ratings can be found on the certification label located on the driver door or door frame."
Easy, yes, to get confused.