620lbs payload and 2800lbs hauling increase isn’t any different than previous SRW 3500s. Compared to the DRW increase of 2k lbs payload and 13k lbs towing.
Until 2024 the 11.5” 14 bolt was in every GM 3/4 and 1ton truck. Yea, there now is a 12” for some reason- let’s hope they didn’t screw up something that worked for 20years.
The 3500 SRW automatically requires you to have a CDL with any trailer. The 2500 can still get away with being rated below CDL class vehicles. So the 3500 SRW is a bad choice to gain a tiny capacity, more responsibility, more expense, and way more dangerous pushing into those weights.