If you don't feel Toyota is giving you satisfaction, let them know you intend to document the cases from this site and inform the appropriate Fed agency (NTSB?.) They keep databases of critical defects / failures like this - they are especially interested in defects which have the potential for catastrophic results (like losing your steering!) They can and will order recalls / warranty repair for serious defects. It may turn out that Toyota can trace this to one bad lot of links.

Jeff
96 T100 SR5 4WD Ext Cab, Warn Hubs, HD torsion bars, Bilsteins, Camper Shell, TJM bar, factory 31 x 10.5's, Powertrax No-slip rear, Recaro driver's bucket