2019 2500 longhorn factory rear air suspension

[mggray87]

I read 2500 and 3500 are basically the same except brakes and suspension giving them that giant leap in towing capacity. That being said. If someone doesn't want to spend another 85+k on a new 3500 can I change my rear suspension to tow as much. Replace my factory rear suspension with heavy duty bags or add airlift bags to it. How would that work. If it's at all possible.
It might be a dumb question. But I'm curious. If possible, I'd rather spend a few grand. Than have another 85k to wipe out over 5 years. Haha