I'm looking at my manual right now for my '05 2500HD. In that year of GMC the GCWR of the 2500HD and 3500HD SRW is exactly the same. 22,000. The dually configuration of the one ton is 23,500 but the truck itself uses up 800 pounds of that. The max trailer weight is the same across the board at 12,000 pounds. I believe that is for the pull type trailer. You only get an extra 500 pounds of pin weight for the 3500.
I believe the brakes and axles are the same in all the SRW models from GM and probably the dually too. I know the engine and trans are identical and will pull your house right off the foundation if you want.
The dually might give you some advantages but the only differences between a 2500HD and 3500SRW are the cab and bed configurations available and many of them overlap. If you want a really big trailer, both trucks are technically too small though you can see them pulling really big trailers everywhere you look. I didn't say its kosher, just common.
I believe the brakes and axles are the same in all the SRW models from GM and probably the dually too. I know the engine and trans are identical and will pull your house right off the foundation if you want.
The dually might give you some advantages but the only differences between a 2500HD and 3500SRW are the cab and bed configurations available and many of them overlap. If you want a really big trailer, both trucks are technically too small though you can see them pulling really big trailers everywhere you look. I didn't say its kosher, just common.