Leaf springs have been around since the earth was still considered to be flat, and for the most there is no point re-inventing the wheel when you have a proven design. Having said that, there is no shame in making a good thing even better right? SAX have come to the party with their range of 3SDS leaf springs which SAX claim will not only increase load carrying ability, but the on-road handling offered by the 3SDS leaf springs is vastly improved over standard leaf springs factory fitted to your four-wheel drive. This has plenty to do with the additional equaliser spring that sits on top of the leaf pack, which help to distribute weight- when loaded up rather than having to rely on a super thick leaf spring or pack with a high spring rate that will ride horribly with an empty load.
POA
https://www.saxsuspensions.com/
