My second one went out last week. I noticed a noise similar to brakes when they get down low. But, when I applied my brakes it went away. I also noted that when turning different radius's as going around corners the "squeek" would go away or worsen depending on the corner. So, I finally took some time to look at it. I jacked up the truck, and could not spin the tire. Took to my buddies shop and took it apart, was definately the baring. This was my second, the first was like Forrest mentioned, about the "slide" you think "man I havnt noticed that before, there is something wrong with this beast... ... ... oh well, its just an old dodge" ha-ha.
But, yea, thats what I experienced with my wheel hub assemblys - BTW, they are somewhere around $325, I am sure you could find them cheaper though, but thats what I had to pay, didnt have time to "shop"
Good luck