2007 3 door 350000 miles eats wheel bearings!

[webfeet69]

hears all the info i know,
The car is my father in laws owned since new. the car is used for package delivery hence the milage. by the way the car doesnt use any oil and he hasnt had any problems until this big problem. He started hearing a growl and found the rt front bearing was bad. replaced the bearing and he still had some noise. they then found the trans main bearings were worn and put in a used trans. all was well for 300 miles! same bearing went bad again! he has since put 5 wheel bearings in the car. he has tried just the bearing itself, new bearing from toyota, totaly new hub assembly from toyota. He just called from lee mass and said bearing is making noise again. 280 miles this time! Any ideas? the only thing i can think of to check when i get the car this weekend is all trans and motor mounts. i am thinking that if the mounts are shot then its possible the engine moved putting side tension on the bearing causing the failures. the car has never been wrecked or damaged.
Thanks in advance,Todd