The payload for that particular truck is probably around 5000 pounds depending on options. The Eagle Cap camper dry weight is 5000 and close to 6500 fully loaded. Add in a 100 pound E-bike hanging way off the back, 2 passengers, a dog, and whatever else is in the cab of the truck and it is way over it's rating. Take it down a bumpy road for a few thousand miles in Mexico and that's what can happen.
Ram, like all other manufacturers advertise max payload that only applies to a truck nobody orders. A regular cab, 2 wheel drive, gas engine 3500 has a max payload in the 7800 pound range. The easiest way to determine the payload of a truck is the sticker on the door jamb that applies to that individual truck.
Link to article.
https://www.thedrive.com/news/broken...ad-a-big-truck