I used to carry my AF on a 2500 with 19.5 and all the other stuff. It was so bad I never went more than 75 miles from home. With the DRW the wife and I have done a 1000 mile trip. Will you be upgrading your rear axle or are you going to run over it's factory rating. You are over or very close to a lot of limits/ratings. Things happen on the road in the blink of an eye. Why would you even consider endangering yourself or others. Add ons do not change anything. They ae a bandaid.
People that think the only diff between a 2500 and a DRW 3500 is the spring pack are fools. It is not the case at all. I do wish you well and safe travels.