*The need to replace OEM shocks might depend on the truck. I am happy with the OEM shocks on my 2018 Ram 3500. The ride might be slightly on the soft side but is secure enough and comfortable. I had Rancho shocks on my 2010 Ram 2500 and cranked them up to compensate for weaker springs. The ride was harsh to the point where my wife complained it seriously hurt her old whiplash injury.
*With a camper on the heavy side, almost any 3/4 or 1 ton SWD truck is going to benefit from some suspension help. I have tried 3 options.
AIRBAGS. These seem to work for some rigs but definitely not on mine. Regardless of the pressure, the ride was horrible with some much sway the rig was unsafe. I worked with my RV dealer, the RV manufacturer, and experimented on my own. They just did not work.
SUPERSPRINGS. These worked really well on my Ram 2500. They leveled the ride, and gave a firmer ride allowing me to drop the Rancho settings for a comfortable ride. They are relatively inexpensive, easy to install yourself, and are to some extent adjustable.
TIMBRENS. These are working well on my Ram 3500. They helped with the sag and headlight alignment and improved the overall feeling and ride. They seem expensive for what you get, but they work and they also do not change the suspension when driving the truck without the camper. I would not hesitate to use both Supersprings and Timbrens.