Chassis chassis and chassis. Just done a Chassis swap on mine after owning it for less than a year. Completely shot and the worst the garage had seen. Air suspension is great although I did ditch the ACE on the rebuild because it would have been a nightmare to sort properly and that comes from Land Rover technicians.
Replaced the shocks with Terrafirma and the wallowing does not exist. I have a P38 as well and both are great vehicles the only issue I have with the RR is all the electronics and from that view buy a pre 1999 and they are, very slightly, less complicated.Would agree 4.6 on LPG.