Mike
Now I don't like speaking ill of anyone and I let it go at the time but they did cost me a fair bit of money.....
I can't believe a suspension specialist would say that.... your car has air suspension.... it automatically adjusts the ride height to the correct setting no matter how much weight you put in the back... the LPG tank full or empty plus luggage plus three passengers will make no difference to the rear camber. If you didn't have self levelling suspension then yes, the lower the rear got the more it would effect the camber.
The tyres on mine were wearing on the inside edge, this is partly due to the characteristics of the car and also the toe-in, mine was out as well.
I know WIM are the bee’s knees as far as the IS is concerned but I doubt they are any better than any other garage with regards to the 430... I emailed and spoke to them at length about revised settings for the 430 to aid driver feel and relieve the tyre wear issues.... I was assured they would sort it with one visit, I presumed they would work out the correct settings for the car based on suspension design, length of wishbones etc etc. I was assured twice that they would sort the car, so I drove over 200miles to see them and low and behold they did nothing, the settings they had were the standard ones as supplied to anyone, they found my front camber was out and went on and on about the serious effects this would have, so I booked my car in with Lexus to have the bottom arm mountings replaced with the adjusted ones... well the service manager phoned me, stated he had checked the settings, found all of them out to some degree (three days after WIM had set them, and no I hadn't hit a curb) including the camber. He had contacted Lexus GB technical dept who had stated that this was not an issue as far as they were concerned and that it was negligible with regards to tyre wear. He advised not to waste my money and said to try it now it had been set up correctly, well I did another 5000 miles before I sold it and there was no uneven tyre wear showing front or back.
So my advice is, get Lexus to check and if necessary adjust the suspension and then forget about it.
Good Luck
Pete
The Target data offered by Lexus for the 430 has never been in desput, so i would assume your car would have been returned to that?... the bit i don't understand is you say you had tyre wear but we did nothing, then Lexus did nothing but the tyre wear went?
This 430 is visibally low at the rear and has camber wear but there's no oem camber adjuster... any ideas?