One problem related to frame rust has been reported for the 1999 Lexus LX470. The most recently reported issues are listed below.
1999 Lx470 Lexus SUV right stabilizer bracket connection to frame rusted through and bar is free floating now. Rusted part is steel frame tang where bolts go through to connect to frame I know Toyota has frame rust problems, dealer found it then rushed me out said weather caused it.