Went to my Ram dealer today. The dealer allowed me to drive two other brand new Ram trucks. One was a base model Ram 1500 with Pentastar and standard sized side view mirrors. The other truck was a fancy LongHorn Ram 1500 with the same elephant tow mirrors as my truck has.
At all test speeds (up to 70 mph), the base Ram with small standard mirrors was as quiet as one could expect from a body on frame truck. There were no turbulent wind noises in the cab or outside of the cab windows. Driving the new LongHorn with the large tow mirrors, produced very similar turbulent wind noise as my truck does. I pulled over to the side of the highway and turned the d/s mirror 90 degreed to the 'vertical' position. To my surprise (and the technicians), the turbulent wind noise diminished by at least 50%. Since the mirror is effectively twice as far away from the driver's window, the turbulent wind noise was considerably reduced.
The dealership is contacting Ram about the noise. However, I doubt anything will be done. The tow mirrors are causing the noise and they are just too large and not aerodynamically shaped. It would be nice if some after market company marketed an aerodynamic fairing that attached to the big tow mirrors.
Another thought is to just replace the big tow mirrors with the handsome Ram Sport side view mirrors. Should be a direct replacement plug n play.