I brought my bro's 2004 Lexus LS430 to my local shop for 4 new Michelin Defender LTX tires and a 4 wheel alignment. They were able to align the front but not the back since the rear camber bar is at a fixed length. Only way to adjust it is to buy one of two different lengths of the rear camber bar at the dealer but the bars are -/+ 5mm from the stock length. The left-rear negative camber is slightly out of spec which chewed up the inner tread which lead to new tires. If the rear camber bars were set at a specific length from the factory then it's probably another suspension component that's worn out. I'm thinking worn struts since the car has 150,000mi on the original shocks and it's possible that spring sag has set in that can affect stock camber angles. Would going to adjustable camber bars remedy the issue or resolve the height issue with new struts or live with the slight out of spec and follow an aggressive tire rotation interval?
Here is the alignment spec sheet:
Here is the alignment spec sheet: