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Most likely is the door seals, check there are no holes or splits. If it has always been the same it could be the mirrors. It depends lot on the age of the car as well, but I would check the door seals first.
this means that your door weather seal is not doing its job two reasons door gasket could be torn or lost its seal the other reason is the door frame has been bent maybe by triple a guys with their air bladders to open the door or some other way,it should still be under warranty see the dealer.
I don't know how loud the noise is, but its weird that you mention 50 mph. At that speed or above you are keep a constant rpm level. I say this because it might just be your air box loose and the sound of the intake air is making it. A 2008 truck should not have any major problem. Sometimes an alternator will sing or whine but never heard anyone say something is whistling. One other thing is sometimes for some reason ive heard a noise like that coming from the speakers of my car that goes up and down with the speed of the motor, but that was when I was tinkering with speakers and sub outs and amps. Thats all I can think of.
I had a similar problem. The dealer change automatic transmission and differential, but the noise continu.
After research on internet i think the problem is the front galiper who create a vibration on the disc wheel and the vibration frequence follow
the front axle until interior car.
Just press slowly the brake pedal and if the noise stop , that's it the cause i think.
I dont change my galiper, but i have a new transmission . :)))
I'm thinking it may be the differential (rear end). With that many miles on the vehicle, it would not be uncommon for the u joints or differential to make noise due to increased tolerances from normal wear. I'd look into that. You may be surprized.