That doesn't tell you how much weight you can put on the truck unless you know the current weights of both axles. You need to look for "payload", "cargo carrying capacity", or something like that. If you can't find that, just fill up with gas and go down to the local scale (usually at any truck stop, garbage dump, and even some moving van places) and weigh your truck. Then subtract what it actually weighs from your GVWR you mentioned above. That will be how much total weight you can put on the truck......remember that includes "everything"...you, passengers, equipment, tools, wood, etc.
You didn't say, but I assume you have the 5.7 engine and it will pull just about any weight....but the frame, axles, wheel bearings, brakes, ect are a different matter.
I'm sure there are light weight campers that your truck can handle. Good luck in your quest.
Ron