They are two separate criteria and both should be met:
- Payload: That is everything that goes into the truck and includes the hitch weight...For a 9k trailer, you are realistically looking at 1100-1200lb hitch weight (12-15% is generally recommended). Add in say 300lb for you and the wife...that's around 1500lb of payload used. If you have absolutely nothing else in the truck...you can handle a 100lb truck camper...fully loaded of course.
- Towing: That's largely how much forward pull the truck can generate (a little more to it but that's the primary thing driving the rating)
So no, you won't be able to pull a 9k trailer and carry a truck camper...at least not if you want to remain remotely close to the ratings.
PS: any aftermarket additions such as running boards count against your payload...so even a 100lb truck camper is likely over the limits.
