I have used three different types of towing mirrors in the past and also found that the 'Milenco Grand Aero' ones are the best which are the most sturdy. However, to eliminate any vibration, the two mirror housing clamps need to be as far apart as possible.
I got a pair of towing mirrows that use suction just wet the sucker turn the knob tight thougt they would fall off wrong could not get them off once use to them brill would not change