I have a 16k GVWR Big Horn. It’s a 42’ er that has lots of leverage. I currently own a 2018 Ram 3500 SRW short box with air ride, rear anti sway and leaf set up. When I first got the trailer, I used by friends 2017 Ram 3500 DRW. The 2 trucks were identical except for the long bed and dually set up. In my experience between the two, the dually was effortless while driving in any circumstance and the SRW must have attention paid to while in a corner and is not as forgiving if not.
That said, the shorter wheel base is better for turning, backing, and everyday driving and the dually is not. The SRW is cheaper on tires, changing a flat, can be rotated easily and has cheaper maintenance like brakes etc. overall, the benefits gained by the dually does not justify the expense and inconvenience of everyday driving for me. And, having a 1999 2500 I will tell you the two are definitely not the same at pulling the 5’er. The 2018 3500 SRW Is far superior to my 99 and very much the same as a DRW, which is just a little more capable.
Good luck with whatever you do. If your sticking it out with the 10.5k, my vote is definitely the SRW (although I would consider a short box dually) (They are hard to find however).
