The AHC system is brilliant, no other word for it and if your wife is anything like mine, trust me, you will thank Mr T everyday for it's inclusions. Driving a AHC equipped truck is like floating on silk. It is that sweet! So leave the conventional springs and dampers for the jungle bunnies because they are not needed on the tough urban streets of Birmingham or Tottenham and if things should go wrong, it isn't going to cost the earth getting it fixed, if you follow Jon's advice and see the dudes at Pleiades.
Right now I couldn't be happier with my UZJ100 LPG after a year of happy motoring.
John
Ha ha, sounds like my wife is just like yours. Tried a 120 LC4 and there was much more pitching and head toss than in the 100. I worry she'd just be sick all the time in a 120....
My new worry is VGRS, seems unnecessarily and scarily complicated and ruinous to fix.