Dualie vs SRW benefits?

I’ve had more DRW’s then SRW’s. The only 2500 I’ve had was a 97CTD with LTE tires, 3042 pound rating. The tow rating was 10,500 pounds with that 3.54 rear end and when I got a trailer that was close to that weight, the ride felt like a boat, and I wasn’t comfortable with it at all, even with airbags. I WAY prefer drw long beds and I’ve daily driven them for decades.
I would really like to know what changes they’ve made on late model SRW’s so guys can tow 17,000 pound trailers and claim they’re every bit as good as a dually. What tire capacities and axles
do they have? Craig