I had something happen yesterday on the way home that got me to thinking about previous replies to my original post. I noticed when I went around a turn to the right at a good rate of speed that my noise seemed to go away. So I tried to duplicate that this morning on the way to work and I noticed that as I went through some curves at around 50 my noise would change slightly as I went around the curve to the left and drop off almost completely as I went around the curve to the right. Then I did a quick double lane change (left) and again the noise went away almost completely.

This points to rear wheel bearings being bad according to earlier posts here. However, the noise seems to go away no matter which way I turn if I turn hard enough. Two bad wheel bearings? Neither one felt hot when I got out of the truck either. Do rear wheel bearings still make sense as a possible cause?