My 2020 Ram 2500 CC CB with the gas 6.4 engine tips the scale empty at 7420 pounds, but I can gross 10K on the truck, so a 16K trailer puts me near or over the 26K limit.
Your 3500HD has a much higher payload, so you are going to be over the 26K limit.
Upon looking at this closer, I think you are right. The GVWR of my 3500HD is 11,600... so even a 15k trailer is going to put me over. Back to the drawing board, suppose I'll be looking for a 14k. Thanks for the info