2015 Ford Explorer XLT 4 wheel drive V6. Slight vibration felt above 58 +/- mph experienced from day one. Feels to correspond to tire/axle RPM, not affected by engine RPM change. Not affected by headwind/tailwind change therefore not likely to be wind caused vibration. Had tire balance checked at 600 miles, very slight modifications made. Had tires road force balanced, again very little was changed. Ford service writers and supervisor have acknowledged the slight vibration and can offer no solution/remedy. Had new tires installed at 50K miles, problem still exists. Checked all 4 wheels and new tires for lateral and radial runout while mounted on the vehicle. All wheels within 0.030" lateral and radial, all tires with 0.038" lateral and radial.
Talked with other owners of same/similar vehicle, problem is unique to mine.
Could it be brake rotor imbalance, bad CV joint(s), bad axle shaft, other?