Just fitted a set of Firestone Coil-rite air bags into the rear coils of my '97 TDi auto, running them at 10psi. What a difference they make. The car now sits level and cornering is great on tarmac. I have just done a 300km run up country and it is a changed vehicle.
S'pose what this really means is my rear springs are shot and need replacing.
Got the bags from Michigan Truck Springs or Timbren, Hellwig Helper Springs, Bilstein Shocks, Firestone, Air Spring Kits, Mile Marker Winch.

Adrian