How many miles before wheel bearing failure?

My front does little wondering and last time I had that on My LC wheel bearings where loose.
So I am thinking to take a wheel apart and see how those suckers look like.
How many miles on average people got on the wheel bearings?
I have little over 30K so I guess that's the life limit on those ?
Anybody try to replace them with something else?
How come 2wd trucks seem to have adjustable front bearings? is there any way to convert 4wd truck to them ?

 

i had to replace at 35k

 

how do i know when they are going out?

 

I have 296k on my OE bearings and no problems yet...

 

mine went out around 130,000. you will know when they start goin out. mine sounded like road noise except 5x louder. it got where you couldnt hear the radio in the truck. and get ready when you go to change it. nobody wants to do it, not even toyota. i took mine to a shop that works on 18-wheelers. they were the only ones that had a press that would knock the bearing out. i think you need 50,000 lb press!

 

Min front right went at 125K. I replaced both front sets. I went with the whole bearing assembly instead of having them pressed out and back in. $420 a wheel... Sounds and rides so much better now.

 

Wow. old thread revived. mine went out somewhere in the 130-150k mark. I just chalked it up to the noise of a 15 yr old truck until I finally upgraded the suspension and tires and really started paying attention knowing I'm keeping this until the end. Many thought the noise was the tires. I knew the sound was similar before and after so installed new wheel bearings and it's a complete night and day difference. This and the ECGS are the best 2 things I've done to the truck with the suspension upgrade a close 3rd. Put them together and feels like a new truck. DK UCAs coming in a few weeks and to say my expectations are high is an understatement.