Will a Mod Cap camper setup put my Jeep Gladiator over its payload rating, and can suspension mods increase payload capacity?

Suspension upgrades generally help the vehicle handle added weight better, but they don't change the manufacturer's official payload rating. The Jeep Gladiator's payload capacity ranges from about 1,120 to 1,725 lbs depending on trim/spec. For Mod Cap builds we typically install a heavier-rate rear coil spring to help support the added weight of the camper and gear.