Looking at several 2000 LX470's and the adjustable suspension has me a little concerned. The complexity of this suspension with it's computer adjusting ride quality every so many milli-seconds looks like something that would cost a fortune if it screwed up (or does it have a default if it fails so you just end up with a regular suspension ride). Anybody know if these suspensions are prone to having problems? Also any other known problems with the LX470's? Other than gas mileage