Newbie needs help.

Your truck with two adults and a full tank of fuel is going to scale at close to 8000 pounds with a little over 3200 pounds as your rear axle load. Stock it doesn't leave you with a lot of load capacity. The sterling rear axle is rated at 9800 but your tires and rims are the lowest rated component (stock rims are rated 3500 each). If you don't care what the door sticker says then if you want to carry a larger camper than a pop up or a smaller hardside you need to upgrade tires and wheels which is why many of us switched to 19.5s. Suspension wise the least expensive ( if your truck has overload leafs) is Stable Loads by Torklift. Lacking the overloads go to a spring shop and get your leaf spring pack beefed up. You have the 7.3 engine it's bomb proof. If you like the truck, its in good shape and you want a camper with some amenities its, easy but not so inexpensive to upgrade your rig to handle the load of a TC