Howling sound under truck at hiway speeds

I have a 2006 V6 2WD Prerunner with 140K. At around 80MPH I hear a faint howling sound under the truck. There is a little play in the driveshaft around the carrier bearing so I'm thinking that might be the problem. But I'm wondering if it could also be a wheel bearing? I have an appointment to have the truck looked at tonight. I tow my SxS in the summer so I want to get it taken care of asap. Anybody have howling sounds at high speed?

 

Group of midgets living in the wheel wells?

 

Bearings shot?

 

Probably wheel bearings

 

Ok sooooo probably not midgets living in the wheel wells...

 

Rear wheel bearings.
If it was like mine; it drones through the whole cabin.
Napa has koyo (oem) replacements. They're not cheap and you need one of these:



The bearing is pressed into the axle. The pic is an axle tube with a plate welded on the cut side.

Good luck.