If you can afford new, the 2020 GM HD's are coming out in June and are a major step up for towing over the 2019's and older. Payload and towing capacity are well up. But I'm sure the price tag is up as well.
https://www.gmc.com/gmc-life/trucks/...ailer-like-pro
Hey, the 3/4 ton diesel crew cab has a brochure payload of almost 3600 lbs.
I'm looking at getting a 3/4 ton gas next year.