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I am a FreeWheeler and have traveld solo for more than 20 years. One of my first purchases was the HitchHelper magnetic mirror. The HitchHelper has a magnetic base, with an adjustable height rod to which the convex mirror head attaches. I can vouch for the durability of these assemblies -- mine is more than 20 years old and still looks and performs like new.
I tow with a variety of tow vehicles so the ability to adjust height is important -- my K2500 takes near maximum height while my Cadillac Eldorado takes one of the lowest settings.
The link below will take you to the HitchHelper website.
How to Use Hitch Helper Mirror
I am have been very satisfied with the HitchHelper.