I have noticed that my 06 350 SRW sits higher than the DRW and when hitched up the rig sits level, 0 swat. Iv'e often thought of a dully but every thing works so well that I think I will keep things as they are.
When we bought the rig we flew from MD to NE to pick up the combo and I did have some concerns about the SRW. I was just amazed at how well this combo rides, even the wife loves driving the rig.
As far as price I always encourage buying a good quality used rig. We paid less than half of the original cost, with a little cleaning and waxing all look like new and we couldn't be happier.
BTW we have a Pull Rite 18K and a More Ride pin box.