My 2015 Sierra (half ton) has a payload of a little more than 2,000 lbs. I tow an 8,200 lb (GVW) trailer and the last time I ran over a scale, I was 75 lbs over the truck GVWR. This is for 2 of us and 2 small dogs. No kids so a lot less gear than a family would have.
I'm looking at the new gas one-tons for when I eventually get a bigger RV. Not much point to a 2500 when the 3500 is less than a grand more and has 1000 lbs more payload. Not looking to get a diesel, and I would avoid a used 2500 Diesel as the payload is not much more than I have now.