One thousand pounds isn't very much of a payload. If you carry a half dozen or so kids and a couple adults in a parade, you could surely exceed that.
I would start at the bottom. I don't think that there is a general rule. But don't forget that the springs also keep the rear axle from over twisting on acceleration.
I have never tried to soften a ride on a big truck, hopefully someone who has will enlighten us both.

John


~ J Lucas
2006 GMC Envoy 4.2 I6
2023 Ram 2500/Cumins 6.7 I6
2010 Jeep Grand Cherokee (Wife’s)
2002 Silverado 2500 Gas 6.0
1941 Chevy 1/2-Ton
1942 Chevy 1.5-Ton SWB
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