04 f-250 4x4 front hub bearings and other

I'm new to the site and posting. I just recently purchased and 04 f-250 with 42,000 miles. I have heard that the hub bearings go out on these. Can anyone tell me how I will know when they go out and about what mileage does it usually occur. Also any other help on problems with 04 that I need to be aware of.

Thanks for your help