You're describing an appearance like it's an action. You want to carry extra weight and engage the overloads sooner. If you're already engaging the uppers then yes, engaging the lowers sooner will help with sag, and sway.
My 2500 Dodge doesn't have upper overloads like the older trucks and no holes in the lower spring to easily attach a wedge or stable load.
What I plan on trying this year is using plastic felling wedges on the lower leaf. They match the angle between the leafs pretty closely and are about the right thickness.
To attach them, you can screw/bolt them through the hole in the spring. I'm considering dado ing a groove in the wedge and hose clamping them to the spring leaf. If it still spits out the wedges then maybe grind a slight "catch" in the leaf to keep the hose clamp from sliding.
It's pretty redneck, but for the little I use the camper, if it works, it's a cheap solution.
2016 Ram 2500, MotorOps.ca EFIlive tuned, 5” turbo back, 6" lift on 37s
2017 Heartland Torque T29 - Sold.
Couple of Arctic Fox TCs - Sold