Take the GVWR of the RV and take 20-25% of that number. That is how much weight will be sitting on the hitch. Of that weight a very small amount will transfer to the front axle. Example my combo is over 28K my pin is 4,500# at 25% pin. Of that weight less than 200# transfers to the front axle. I have my B&W hitch set full forward.
Never look at the unloaded trailer weight. Never just look at what your truck can "tow" because pin weight may overload your rear axle.
3500 RAM/Cummins with the Aisin trans will make a great towing machine. Just don't overload it!
