Wait and see, but expect to need something.
Our 2020 F350 4x4 SuperCab 8' bed w camper package (awaiting build of Hallmark Ute) just carried it's 1st heavy load, 2 yds of rather dry mushroom compost (probably under a ton) that with a crude measurement on uneven ground lowered a rear wheel opening 1 3/4 inches.
Ride and handling good and no excess body roll w camper package rear anti-sway bar, but steering just slightly floaty, as on level ground vehicle barely sagged to rear, thus affecting front alignment.
Hallmark recommends Torklift upper StableLoads on these to at least start out with but I'll keep original bumpers if I don't like 'em and later install heavier spring packs, probably Deaver. StableLoads, taller jounce bumpers, add-a-leaf, or aftermarket supplemental air bags generally carry extra load starting with suspension at normal travel height or compression, thus making suspension firmer upon compression from that point onward but unchanged upon extension or rebound from that point. Adjustable shocks set with with more stiffness on rebound might be needed to control this. Your stock suspension increases stiffness as an arithmetic progression through entire range of travel of main leafs, then sharply steps up as each overload leaf is engaged. I suppose one could say that is overall a progressive suspension.
Off-road, some have found StableLoad (either uppers or lowers) harsh, even with a load.
Taller rubber jounce bumpers may gentle severe bottomings unless stiff in very cold weather, and may need periodic replacement like shocks.
The air in air bags increases stiffness at a geometric progression and if inflated too firm may bounce like an over-inlated tire or basketball, even with stiff shocks trying to dampen them. That said, many like the Firestones for varied loads. Systems that supplement existing springs won't leave you stranded if they leak as you can still get home, with a sag. Some ambulance-type airbags that replace springs can be more problematic upon failure and you might be limping to nearest garage.
If a load is to be left on almost full-time, for reliability, probably the best solution is a heavier spring pack. But, as they're easy on and could be removed, I'll probably just start out with the upper StableLoads.