Just a brainstorming - to avoid the difficult job changing sagged leaf springs, would it be an alternativ to complement the sagged leaf springs by adjustable coilover shocks to compensate the "sagging"?
I think “complementing” would mean the 2 springs working in parallel compared to conventional single coil over system. I would hazard a guess that the extra spring rate required to lift a “sagging car” at static might make the overall combined rate really stiff and an uncomfortable ride. It might also affect the front to back balance of the car.
Just responding to the interesting brainstorming.... I really don’t know
