I would suggest a 2500 for a dodge. "Generally speaking" as the 1500 dodges have usually been the softest, lightest capacity and payload of the full size 1500 models. You will probably want a minimum of 1800-2000 lbs of payload. 1000 lbs for 4 people, and 1000 lbs for a ball mount. 1500 if you go 5w.
Yes my 1000 lbs of people may be too much....but include extras such as food, books, first aid kits etc, not included in normal weights with clothes on. Most of us have 5-20 lbs of clothes on. Summer shorts tee shirt, to winter with boots, coats etc.
My GM handles 2000 lbs just fine, including people, Ball hw etc. I have a 4000 lb rear end capacity. I've seen dodges as low as 3000. GM has an option for a 450/, Ford iirc a 5000 lb RA.
Even my 4.3 V6 has the power to pull 7-8000 lbs better than many BB V8s of your!
In your case, mine too, the old 8600 8 lug suspension 25 would be perfect vs the monster gcwr with a bit more, but not that much more payload than today.
Keep some of this in mind too
Marty