With the camper loaded, you want your upper overload springs to engage which help with porpoising and sway. If you still have sway after engaging the upper overloads, you most likely need a heavy stabilizer bar.
Because each truck and camper is slightly different and what people bring with them varies, there is no correct answer what to do before you try the camper on the OEM setup. Once you have a couple trips completed, you may find some traits of handling should be addressed and then we can make suggestions that will not drain your wallet with questionable improvement.