I cant say that I can compare SRW to DRW braking characteristics as ive only ever towed heavy with a dually or our semi for the business. I can say that my 2015 cummins pulled and stopped night and day compared to our 07 but that's to be expected. I can also attest that our cummins pulled and handled our rigs better than my 2015 gmc dually. Id use our Kenworth but that's REALLY not family friendly.
Essentially just keeping an eye out for a lower KM ram 3500 srw, mega cab would be nice but I also haven't towed with a short box I understand that has his own set of issues. With the cost of new trucks now-a-days I wont ever buy a brand new one off the lot again. At 93,000$ for our 2015 I just about puked. My father inlaw just dropped that SAME number last week on a 2021 GMC AT4 3/4 ton.... you cant be serious.