Seems you are arguing against your own argument. Hard srpings and uneven ground means less weight on some tires and more on others.
I already did explain it once. It has to do with equal weight distribution on all the drive wheels. A truck with hard springs on uneven ground does a lousy job of keeping weight equal per tire. In fact, if stiff enough, on uneven ground sometimes a truck (or trailer) wheel will come off the ground or barely touch. Add that to a truck with an open-differential, and hard springs make a big difference (in giving poor traction).
I'll add that it doesn't have to be leaf springs. Same can apply to trucks or cars with torsion bars adjusted too hard.
Sounds like you never drove same-size rear-wheel cars or trucks - with both setups? A prime example was the Dodge Dart (with leafs) compared to a Chevy Chevelle (with coils). Night and day difference in traction on rough roads.
I ruined empty-traction on many trucks when I beefed them up with rock-hard springs - instead of buying premade progress-rate springs that work much better.
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