I didn't know that GM had dropped the 2500- too bad, it serves a real niche. Towed with 1500 Suburbans for 10+ years and 2500 for the past 12 years.
The springs, tires, etc does make for better HANDLING vs. the 1500. As far as PULLING, minimal difference.
The 2500 is a lot less comfortable as a grocery hauler- much stiffer ride (no big surprise).
I HATE the 6-speed tranny...spends LOTS of time in 4th, 3rd is common, and occasionally 2 (on the Intrastate, no less) Fuel mileage is nothing special. I see almost no performance difference between this truck and our oldest 5.7 4-speed 1500 with a 3.42 rear end. They added a Granny gear (which we really didn't need) and an overdrive on top, leaving you with very similar middle 4 gears.
Just put new engine mounts in our current truck (110K miles)(shoulder shrug).
Also, I posted "the opposite" thread to this asking about switching to a pickup. No question, the Suburan will haul more buttocks, and heat and cool your suitcases, although that third row SUCKS in comfort terms.
Looking forward to updates.