I can't speak to the 350/3500 series, or DRW. But, I do have a 2012 F-250 and added a long add a leaf and Bilsteins. The sag with my trailer with a pin of 1850#'s (give or take a little depending on load) was considerable. The truck had basically zero rake from the factory and the springs were weak at best. Now its does fantastic with the load. The combo between the leafs and vastly improved shocks made a world of difference. It was cheaper than trading of course, but it still sucks that mods have to be done to make a Super Duty truck handle the loads such as mine. Now as another poster has already said. I'd bet with the weights you mentioned and a 1 ton DRW truck, you'd be perfectly fine.