Replacing wheel bearings - do one at a time or replace as a pair?

Hearing a high pitch, constant squeal from the front right wheel and I suspect it is the wheel bearing. I have 112,000 not so easy miles on the truck, so a worn out bearing is probable. I haven't blown out the rotors or drums for dust yet (kicked up a lot of dust this past weekend), so I still have some hope.

Should I replace both front bearings at the same time?

 

A smart move! Cause you know the other will follow soon.

 

sure it isnt something else,most of the ones i have heard roar.....

 

I'm hoping it's dust in the rotors/drums.