Here's what I found on only 2 vehicles with airbags. A f250, 1996 and a F350, 2002.
When a really heavy load is engaging the overload springs the ride gets rougher than went not. I found that using airbags with enough air to have the load just resting on the overloads or showing just the rear bump stops engaged. The ride was not as rough. I would use around 20 psi to get that and felt it the best ride. In my example the rear bumper would only move upwards an inch or so. It was not correcting a rear end dip with headlights aimed too high.
At times I have carried a heavier load in the bed of the f350. I would still raise the overload springs to carry some weight, not all.
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2013 24RKSWE (27ft TT) Cougar 1/2 ton series SOLD 10-2021
2013 Ford F350 4x4 CC 6.7 engine, 8 ft bed, 3.55 rear end, lariat package
Retired from Oregon State Police in 2011 than worked another 9.5 years as a small town traffic cop:
As of 05-2020, I am all done with 39 years total police work. No more uniforms for me.
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