My 11200-11400 lb 5th wheel rv trailers pin weight adds 2200 lbs-2400 lbs to my '03 2wd 2500 Dodge/Cummins rear axle.
I keep scale axle weight tickets in all my trucks. This truck weighs 2840 lbs on the 6000 rawr leaving it with a 3140 lb in the bed payload.
Actual scaled rear axle weights after loading the trailer and hooked up runs in 5200 lbs to 5400 lb range varies depending how we load the trucks bed and in the front of the trailer. Well under the trucks 6000 rawr.
Certain years and configurations of 2500 Rams came with 6000/6200 or 6500 rawr.