Could be many things but a front wheel bearing/hub assembly going bad comes to mind. Scalloped worn tires can give you a humming noise also.
The 2012 Chevrolet Tahoe has 16 valves.
The 2012 Chevrolet Tahoe has a V8 engine.
The 2012 Chevrolet Tahoe has overhead valves (OHV).
The 2012 Chevrolet Tahoe is 16 ft. 10 in. (202 in.) long.
The 2012 Chevrolet Tahoe has a 6-speed shiftable automatic.
The curb weight of the 2012 Chevrolet Tahoe is 5448 lbs..
The 2012 Chevrolet Tahoe-Hybrid has 16 valves.
The 2012 Chevrolet Tahoe has a drag coefficient of 0.36 Cd.
The 2012 Chevrolet Tahoe's turning circle is 39.0 ft..
The maximum payload of the 2012 Chevrolet Tahoe is 1652 lbs..
The height of the 2012 Chevrolet Tahoe is 6 ft. 4.9 in. (76.9 in.).
The 2012 Chevrolet Tahoe has a 17.0 degrees angle of approach.